I haven't really seen many parts (at least enough parts to build a complete PC) in a store. I usually shop at Best Buy if I'm not buying on Newegg, and all they have are simple stuff like replacement hard drives, power supplies, optical drives, and RAM. I doubt you'll find motherboards and CPU's there, though they usually have a limited selection of overpriced graphics cards. Don't bother asking them for advice, because most people that work at these places are just trying to confuse you to buy more stuff at higher prices. Never buy a warranty with Best Buy's Geek Squad either, should that apply to you, because they don't know much of anything and took 6 tries to fix my computer (the motherboard went bad and wouldn't POST, they swapped it out with a mobo that had a defective Ethernet controller and a COMPAQ BIOS [it's an HP computer], and it took them a few more tries to fix that, and they also needlessly swapped my hard drive, just so they could try to fool me into buying a "data recovery" for a perfectly good drive). Of course, I was only like 12 back then so I didn't know much, if I were to repeat now, I would've laughed at the stupid person behind the counter, told him why I would not fall for his stupid marketing tricks, and carry my PC right out the door still broken. Then back up the hard drive and then take it back for repair. It's still not worth it though, replacement motherboards are cheap these days, at least equivalent to warranty prices.