Check GSI. I wouldn't call it scuba webbing (it's better quality), more of a rigid belt webbing. They have one called 4015 which I've used to make gun belts, and they have another called 4050 which is a different weave (Type 13 construction), and a little slicker. Both are (or were, the last time I checked) available in black, coyote brown, tan and grey. The colours are a little off on the samples I have, when compared to the Texcel webbing colours, but they are good enough.
MOQ is 100yds per colour and I think the 4015 was $1.36/yd and the 4050 was $1.10/yd.