First off, go check out the current catalog and purchase an album or two or five!
Once you've done that, check out Hildsvfar Records on last.fm. Currently there are several albums available to stream so you can preview them before you buy them.
The current streamable catalog is
2008 Morgue Rat & Satan's Basement split
2007 Cerebral Apocalypse
2006 Sludge Filled Wasteland
2008 Instinctive Obliteration
The Astronaut King
2008 Astral Asphyxiation
2008 Live@Stage 83 7-20-2008