Newegg used to be good. I bought a lot from them, too. Even had a shirt. They haven’t been good for a while. I don’t know all the details.

Real ones — computer builders, I mean — would just use PCPartPicker and buy from whoever had the best prices. Even if you didn’t need their tools to tell you what was compatible with what, the site was fun and free and it saved you money. Used to be, Newegg had the best prices, but they started getting undercut by Amazon and others. But there was some other drama with them, too.