I, too was looking at that 5qt w/filter O'Reilly Full Synthetic $19.99 special but there are some questioning the quality of the oil, expecially since the NOACK results of their dino got failing grades.
So with the jury still out on the O'Reilly syn, I have pretty much decided on either the Pennzoil Platinum or the Valvoline SynPower that are also on sale there for $3.99 ($19.95 @ 5qts).
I could get a good filter for $3 or $4 dollars for my car, or a Wix for $6. So I'll probably go that route.