Check pet shops that specialize in reptiles. That's where I got all the corkbark for my paludarium.
I think I have a piece left over, I can weigh it and try to get some idea of how much you'd need...
Also note, you might need to order extra, so that you can find pieces that fit your tank/design properly.
_______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://www.actwin.com/mailman/listinfo.cgi/aquatic-plants