I shop microcenter in person (massachusetts USA but they have other locations) for sd cards/ external hard drives etc. They seem to have good selection of computer hardware and decent prices, and have a lot of embedded stuff (pi/ arduino/ some ada fruit kits). Kits for kids (of various quality).
Surprisingly, the CPU+mobo combo I just bought for a new build was cheaper from a local Microcenter than Amazon. Plus, I could get it the same day (ordering it on Saturday night, I'd get the mobo Sunday and CPU Tuesday if I did Amazon -- went next day and got both from Microcenter for about $50-60 less).
This has typically been the case for probably close to a decade now. At some point around the P4 extreme days (iirc) they made a business decision to stop getting utterly killed by Newegg and Tigerdirect. There was a lot of talking on the various enthusiast boards about it at the time whether or not it was going to be a good long-term move.
The loss-leader strategy appears to have worked! I typically try to buy from Microcenter now when possible, and I almost always give back that $50 cpu/mobo combo savings in margin on the rest of the build (and then some) simply due to convenience.
Monoprice/ newegg for the other stuff.