Personally I have driffed towards 4 main shops because they've got great catalogues and devilver in a few days.

1. www.music-head.de for german techno because its only 6 euro + P&P
2. www.juno.co.uk because they are just excellent
3. www.gemm.com because if it ain't there etc.
4. www.nuloop.com for more german stuff...