Help sourcing Duvetyne for my tribe

I have been charged with sourcing new duvatynes for my fire tribe for the upcoming year.

Finding it online doesn't seem to be hard but finding it for an affordable price to get lots of it does seem to be a bit harder. We end up burning through a bunch of duvas every year because we always have a few new spotters and it seems to take people a while to just stop being afraid of the fire and put it out.

Does anyone have any tricks to finding a bunch of affordable duvatyne? Or a place where I could source a roll of some heavy stuff that won't cost me $500?

Thanks -Bossy