UGH... Pepboys, run far far away! I have never had a pleasant experience with them ever, and know several other that share my experiences.
I did purchase tires from them, and had them mounted on wheels, then carried them away as they did not want to put them on my vehicle, but as you can see, I found a way around that.
The ol buy the wheel/tire package then take em home and mount them works out well.
That price isnt a bad deal for the install, but for what you learn by doing it yourself, I would definitely do it myself, especially when you have soooo many people nearby to help.