Trugrit and Supergrit are where I get all of mine. The each have some belts that the other doesn't carry, and have a different assortment of accessories/safety/materials/supplies, so I usually alternate between them depending on what else I need with my belts.
By Norton's literature Blaze belts only seem to come in 2x72 or bigger and small ones for belt files. I've been looking for them for my 2x48 but have had no luck. All this talk about Blaze and other premium belts has got me hankering for a 2x72 or at least a way to convert my current K-zoo.