I am ordering today and will provide a specific example to refute the subject here. Take 5% off with coupon to negate 5/6 of the sales tax.
I am getting wiper blades for my wife's GM. Because she has Valeo arms, they have pinch tabs, and I only use (from experience) the OE blades.
20945799 and 5800 -- used to get from a Chevy dealer in VA on eBay for about $17 each. They are $17 and $19 on rock, with the shorter pass side more. Go figure.
Then, I'm getting 2 rear wipers. They are $7.xx on amazon. $4.79 at rock.
Would it make sense to pay $10.99 shipping on the above? Well, maybe not on the front wipers. But the rears already save $3 each, or $6. That can go towards the $10.99, although today, I think the wipers are no longer $17 on eBay, so let it slide, maybe add $2.50 shipping to each.
Now here comes the boom.
Add this, 3 gal, Toyota pink coolant @ $13.74 each, same $10.99 shipping. There is no pink coolant available anywhere for that cheap.
https://www.rockauto.com/en/moreinfo.php?pk=7668684&cc=1432014&pt=11393&jsn=1647
edit p.s. post pandemic, the wipers are now $24 on eBay, so the $10.99 shipping is totally justified and the coolant is free shipping
https://www.ebay.com/itm/3030884540...7IcdjcuOY+7VUgnbrB1V1fYzPLIp|tkp:BFBM3IyM8o5i