Euclid Records in St. Louis is an excellent store. They don't have the write-ups like Dusty Groove. But their selection is very good -- maybe even better than DG's -- and their prices are reasonable.
But, like Niko says, I probably buy more records -- both CDs and vinyl -- off Discogs than any other single online store. If you're like me, you'll likely end up finding Discogs sellers that you like and checking in with them often.