The one store I deal with will give me a few and I have also
bought them at some of the fish shows.
There are a couple of online dealers that have them also.
I have purchased from Ken's previously but not online. At major shows.
Jehmco is a supply house for most fishroom needs. I have purchased
other things from them but not bags. They do have them, just never
tried them for bags before.
www.kensfish.com
www.jehmco.com