Have any leftover chimney liner insulation?

[ort5]

I am looking for a small (3 feet ish) section of chimney liner insulation for my gas insert. I need it to keep condensation from forming on the flex pipe in extremely cold temperatures. Anybody here have a small section they could spare? If not, where can I buy short lengths?

I know this is the wood burning section, but you guys are the ones that use the insulation!

Also, anybody know if I could just apply the same insulation to the thimble in my wall which also forms condensation?

Thanks!
Dave