I just recently inquired about this in the UDS thread. I found some at home depot that was not fiberglass, but recycled denim material. I thought about doing that due to the fact that I hate fussing with fiberglass.
If I could I would. If I don't, it's because I am to lazy!
UDS | Brinkman Gasser | Big Poppa Drum
On Deck: Weber OTG