Akihabara or Akihabara Electric Town is the area in Tokyo for electronics. Its especially great for computers. The prices are pretty reasonable. It, arguably, beats Guang Hua in Taipei, Golden Market in Hong Kong or Sim Lim in Singapore for computer part selection.
There are broadly 3 parts (that we found). There is the street area that has lots of little (and some not so little) shops, many of them with price lists outside.
The variety is better than most asian PC markets (imho). I found a store specialized in embedded stuff. It had a huge range of Via mini motherboards and associated parts.
Then there is the giant Yodabashi Camera Store. I suppose it was once a camera store. Now it sells anything with power socket. The camera selection is great and if you want to try out all the different cameras to see how they feel then this is the place. Basically you can find pretty much anything in there.
And finally there is the undercover area which is like a rabbit warren of little stalls selling all manner of electronics stuff.
If you have any interest in electronics stuff then Akakihaba is worth a look. And if you live in Tochigi and are sick of the, overpriced and limited range of PC stuff here then definitely pay it a visit.
The best way to get there is to take the JR Yamanote Line from Tokyo station to Akihabara. Its just a couple of stops. From the platform take the escalators down (not up) and you will be pretty much in the thick of it. (for the camera store take the up escalator).