Dunno if they're still around, and they never had a web presence I know of, but Second Coming Records in Cambridge, MA was a good source for me. The biz card I still have says:

Second Coming Records
1105 Mass. Ave.
Cambridge MA 02138
(617)576-6400

It also says mail order available.
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Dave Clark Georgetown, Texas MK2A 42Gb - AnoFace - Smoke Lens - Dead Tuner - Sirius Radio on AUX