Looking for pyro sites that sell large tubes

[SamGurdus]

I am looking for 1-3" diameter tubes to make smoke bombs from. So far, I haven't found anything larger than an inch. Are there any sites that sell these?

[dagabu]

Look for carpet cores, fabric cores, lamination cores, just about anything that is wound up on a roll will have a core. And free is better than paying someone for them.

[chuckufarley]

I get shrink wrap tubes from a friend that works in a factory. 3.5" od, about 2 3/4" id. They go through dumpsters full every few weeks