Can't speak for the service side of this store, but I do shop on the retail side as they always have some interesting motor oil and oil filter sale going on. The last time I went in they had 5 quarts of Valvoline synthetic (usually 8.79/quart) and a filter (usually 5.99) on sale as a package for $29.
The manager at this location has been really accommodating regarding returns & exchanges - sometimes I will buy a part and not have time to work on my car and by the time I realize it is the wrong part, the return period is up. In a couple of these situations, the manager has exchanged the part for me anyway, which is super cool. Always keep your auto part receipts.
If something is on sale at Pep Boys, it is usually a pretty good deal. Regular-priced merchandise here is more expensive or the same price as Wal-Mart. For oil filters I generally prefer WIX filters which are only available at O'Reilly's Auto Parts stores. But Pep Boys has deals on Mobil 1 and Valvoline oil, which I prefer. The oil deals at O'Reilly's are usually on Castrol and Pennzoil.