There are a variety of good vendors for epoxy and fiberglass/supplies.
If you are doing clearcoat finish on your canoe, West System's 105/207 combination is good as is System Three Clearcoat, MAS (Low Viscosity resin IIRC), and RAKA among others...
You'll need 4oz cloth for inside and out, - S or E-Glass (E is stronger, but S is more likely to be available and a bit cheaper)