IJ Technologies offers six canvas SKUs in 64". They are Black Diamond (18 mil) in Gloss and Satin, Premium Edition (20 mil) in Gloss and Satin, Premium Edition Water-Resistant (22 mil) Matte Canvas and Premium Edition Artist Texture Canvas (21 mil) in Matte. They offer four other styles, which top out at 60", 54" and 50" depending on the canvas. They also produce two solvent canvases, one of which is available in 62", the other at 60". I am not aware of other sources for 64" canvas rolls for aqueous printers.