Autozone running 20% off oline purchases

Yea, well I bought a bunch of parts online from them recently and didn't realize I only ordered one head gasket for the small block.
When I ordered online the website said pickup in store was not available and that it was ship to home only.
The wife (it's her car) called them and they said they had them in stock, and got the in stock one for about 6 bucks less than the one I ordered online.
6 bucks isn't a huge deal (a can of engine paint), but there was something fishy there.