Anyone been to any of these stores in Akihabara??

Best place for selection (that you can walk away with) but not always prices. Are there good deals? Yes. Do you have to find them? Yes. It's not so bad if you live in Japan... no real harm done if you go once a week and only find a few things once or twice a month. If you're visiting, you'll need to be lucky. I have bought many things for prices as good or better than Yahoo Japan.