Mine would be ForeverUnderground, EvilMusic, Unmatched Brutality and Aquarius Records (sf - not completely metal, just an unusual selection). Unmatched Brutality sells on ebay and often times (especially if no one bids) I am able to get CDs for $5-6 bucks new.
On the hardcore/crusty side of things, Crimes Against Humanity has a large selection and cheap cheap prices. They also carry a lot of underground gore/grind stuff.
On the hardcore/crusty side of things, Crimes Against Humanity has a large selection and cheap cheap prices. They also carry a lot of underground gore/grind stuff.