I remember a few years ago the legendary Kanoes organized a BWCA.com group buy with Ursack. I did a search on this site, it happened in the summer of '15. Kanoes asked who would be interested in participating, and contacted Ursack and asked to see if they would discount their price. Looks like he got about 30 or so people to make the buy. Times may be different, I don't know what the Ursack supply chain looks like in these times, but it might be worth a shot. Just a suggestion, and I'm not volunteering (!!!!) to contact Ursack.
Kanoes Ursack Thread