Lost gas cap

So, like an idiot, I left my gas cap on the roof of my truck after refueling and drove away. Needless to say, it is now gone for good. Can I buy one of these at a local parts store, or will I need to order one from Isuzu? I did the same thing with my oil filler cap a while back. oil sprayed everywhere under the hood. It was leaking like crazy and I though I blew a main seal, but nope, I'm just an idiot. :) I was able to get the oil filler cap at Autozone. Just wondering about the gas cap now.

Got my replacement at walmart, works fine.

Yup, AutoZone cap works.