Composites Canada in Mississauga supplies carbon as well.
Masuelli uses glass tow for at least some of their bikes. It's perfectly adequate if a little bland looking. The Glass tow from Aircraft spruce is the stronger variety of glass. S as opposed to E.
Carbon is incredibly strong and most carbon wrapped lugs are likely heavily overbuilt. By the time you get a lug looking good it's pretty much guaranteed to be strong enough.
Where are you sourcing bamboo from?