I work at autozone part time just for play money. We get a 20% discount and then something like 5 weekends out of the year we get 30%. BUT, the prices are kinda ridiculous. I'm building a rear axle for a 66 mustang and putting discs from a 04 cobra on it. From autozone for the calipers and brackets it's $269 plus tax and plus the mounting hardware. From Rockauto it was $175 shipped with the hardware. There's a catch though, the calipers had to be ordered from the vendor, and we don't get a discount on ordered parts. That's just one example, but it's pretty much that way with everything in the store.
I don't know about orielly's, but I interviewed there and I would have been getting paid less, but plus commission. The local store isn't very busy, so I took the autozoo job.