Second Layer
Volcanic Tongue
Boa Melody Bar
Norman Records
Smallfish
Microsuoni
Mimaroglu
Downtown Music Gallery
Aquarius
Of those, Boa Melody Bar is probably my favourite, as Gayle seems to manage to have quite a lot of out-of-print stuff in stock, followed by Normans, as they send sweets with their orders. I rarely buy anything from Aquarius, but I refer to their reviews a lot.