After an exhaustive search I have finally found a distributor that has Epson Exhibition Canvas Gloss Natural (OBA-Free) in a 17 x 40 roll. All of my usual resources have it as back order only.
Anyway, I found this little place called (at)lex and they seemed to have ALL of Epson Natural canvas products in stock. So I placed my order.
I'm totally excited about this because I have never done canvas printing before! But I look forward to having another product to offer!