I bought mine here but there are lots of other sources. Next time I buy bags I'll probably order from The Web Restaurant Store as they have a great selection of 4 mil and even 5 mil thick bags. Thicker would be better for sealing firestarting stuff, I think.

Of course, a lot of stuff can be sealed with a $45 Rival vacuum sealer. My brother has one and it works well. It's tricky to seal very wet items and it won't seal a retort pouch but it's fine for general use. I've sealed a ton of bandages, bundles of fatwood, etc with a similar unit.

But it is really cool to finally have this bad boy!