I learned how to negotiate buying cars from my grandfather and oddly a lesser extent from my father. Basically, find a salesperson who has no problem going through hoops and doesn't pressure. Back in 2004, my grandfather took me as his wing man when he wanted to buy his last car pretty much (he is still alive but retired from driving about 15 years ago) which after some consideration, he was interested in a Buick Rendezvous. I helped him out researching what dealer had the best inventory; I remember using I think it was the "find your car in stock" tool on GM's website in that time period; he was wanting to go for new, but I found that the Buick dealer about one town to the north of us in Upstate NY had in the "Certified Used" section a 2003 Rendezvous with VersaTrak 4WD and trailer hitch with only 7500 miles on it. Price was I think was like 17K, which was actually pretty nice since the 2004 and 2005 models at the time were listed at like 25-27k MSRP.
I put it on the list of car dealers to look at; after my grandfather and me being pushed around by several dealers who didn't seem to want to actually sell us what we wanted, we go to that Buick dealer. The salesman that found us, he was a nice guy and guided us to that vehicle; immediately let us do a test drive, peek and poke any anything, got us the service history, everything we can ask, he got an answer. Long story short, the owners of the vehicle became deceased, daughter of the owner did a trade-in on it. When it came to sitting down to push numbers, it was easy. We even had the dealer owner there who legitimately was doing raise evaluations. I think we pushed the paper back and forth like 2 times and got the price down to 14K which was pretty good.
Salesman of course, then goes "So, I know you said you want to do cash for this, but would you be interested at all in entertaining talking with your finance guy?" My grandfather said to him "You have been the best salesman at all the dealers I've been to today. I'll tell you what, I'll talk with him, but I am not considering anything worse than the rate my bank of 35 years will give me which is 5%" So the salesman takes us other to the Finance Manager, who we explain this to and is still present in his office. He plugs in his info, he is adamant he can get something lower than 5% thru GMAC and a few other lenders. 5..4..3..2..1..and.....GMAC gives him 5.1%, the others were all about the same, but nothing lower than 5%. Salesman and me and my grandfather just start laughing. Finance manager just looks at his screen super confused and then goes "I've never seen GMAC do that before..." and the salesman goes "Well, we tried...lets go do paper work and visit the cashier..."
My father however, he liked making the sales and finance people jump and mean jump. I think it was on when we bought his 1993 Wrangler Sahara Edition from the used section in a Ford dealer, the night we went to go pick it up, we had to meet with the Finance Manager. My father had financing already lined up as I recall thru his bank at the time, but the sales person insisted that all sales paperwork must be stamped and signed with the finance manager before they give him keys. That seemed fishy to him considering that my father is a big believer in just walking out the door when thing go weird at a car dealership, however he was happy with the salesman and the dealer overall at this point, so he would go visit him, which was appointment time of 5:30 PM. I was 8 years old at the time, my dad told me while we were driving over to the dealer with in our trade in car (1989 Nissan Sentra Wagon) that he is going to test this "money goon" as he called him; he wanted me when he grabs my arm, to start complaining to him that I am really really hungry since we had not had dinner yet thanks to this guy..."
So 5:30 becomes 6:00 and we finally see the finance manager who had an office at the back of the building by the service department far far away from the sales reception area. He tries to push Ford Credit on my dad, an extended warranty that is only valid at their dealership, and something else silly like free tires with the purchase of TruCoat. My father politely said no to all of those, but the finance manager was just not liking that. So my dad grabs my arm and I say "DAD! DAD! DAD! I'm hungry...really hungry...why did this guy make us come at dinner time to get our Jeep? He's mean!" My dad I can see wanted to murder me for going THAT far, but hey, I was 8! The finance manager goes "Oh, I didn't know it was that late...there is no one over at Ford Credit right now to complete this tonight even if you said yes. You got your bank info ready? We have you done in 5 minutes and on your way in the Wrangler."
So 10 minutes later and we are walking to the Wrangler with keys in hand and the salesman we were talking to comes up and goes "I heard he was being pushy on you. I tried to tell him before hand you got better financing and it didn't make even sense to the SALES manager to try to sell you the dealer extended warranty on an non-Ford vehicle, but Mr X disagreed. I also heard your son was hungry so I hope you don't mind I bought him on the house this Burger King Kids Meal for putting up with that and giving me a sale."
Likewise, later when I became an adult, when the "Cash for Clunkers" program was going on in 2009, I was interested in getting a brand new car. Decided since my friend was really happy with his Chevy Cobalt. I decided that would be a good car for me. One of the dealers that went to was has a huge reputation for having odd customer service issues, but I gave them a shot since they had a lot of Cobalt on the lot which appeared to be from other dealers that GM closed at the time. I had planned ahead and got fiancing thru my credit union, even the CU told me that dealer is one they reguarly work with, Found one with good options and a decent sticker price oddly, was a Cobalt that came an closed dealer. 1st salesman I talked to, he had to jump start it and put gas into it for the test drive, but was fine other wise. I was going to require they replace the battery when it came up.
Anyways, time to talk turkey and...I get passed off to another salesman who was lets say was your classic sleaze. He showed me a different price at first that was $2000 more than sticker for "NW delivery charges" which I called him out on should be listed on the sticker that clearly shows it came from a different dealer. He magically got rid of that and the price was right, but not a good deal like I said. I can't remember it was now for the life of me. He asks about financing, I told him I have something lined up from CU which is around the corner, which liked but said "Can I get your info again to give to our finance manager still?" Which I said, I can give you the info from the CU, which he said he needs it all for the application, which I said I am not filling out again for you to run it. Which there was some back and forth of no and yes, then finally he goes "Lets not fill out anything...just tell me the basics so I can verbally tell him so we can get thru this." I'm clearly reading they don't want to sell this car to me, so I just give him rough income info, which he writes down an post it note, goes into the next room and about 15 minutes later, comes back and goes "Well, our finance manager wants a co-signer for this..." which I respond with "That's funny, my CU doesn't...so....who said that?"
Which the sales guy said "Well, OUR financing said that."
"But I didn't ask for your financing...I have mine!"
"Well, we would be more comfortable using a more reliable source of credit than a CU here..."
"Who is we?"
"Well....uhhh....our finance manager..."
"I told you have my own arrangements..."
"Hey, look if we can just get you to an application, we probably can match your CU's rates..."
"I'm done here. No wonder this dealer has an reputiation. Have a good day..."
Then I walked right out. Changed my mind and held onto my current car till a deer took out my car and I just bought a decent used car from a private sale. But the the funny thing was that I got a follow up survey from GM in the mail regarding why I did not purchase the vehicle, which I wrote it was the dealer experience. I got a call from GM Customer Service team who wanted to follow up on that process because the whole sales process is not an standard GM dealer practice and there has been multiple complaints about that dealer since they became the only GM dealer in the area.