well, got the pack filled at the paintball place for 3 bucks. took it home and blew it in the back yard. works great. super easy to deflate, fold, and repack. super easy to replace the burst disk. got it refilled again and i'm all set.
one thing i like about the Snowpulse (non RAS) bags is that after a minute or two the bag self-deflates so that in the event of a burial you get the advantage of the airbag-sized air pocket.