Oh dear. I fear I may be getting poorer imminently, on discovering Boomkat. While I like Amazon, their track previews don't work with my Firefox browser on Linux (they encode using an obsolete RealPlayer codec which my RealPlayer doesn't like). However, Boomkat has a Flash player which does work, and masses of obscure techno to boot. I've ordered a Chicago acid house retrospective, the new Field Music LP, plus a couple of cheap compilations on Rephlex and BPitch Control. Prices are pretty reasonable, slightly more than Amazon in some cases, but they have decent reviews, plus I can hear the tracks, and I like to buy where I browse. Can't wait.