Last week, after a frustrating search for roll canvas around my city (Perth, Australia) I settled for a large roll of Fredriks black canvas (200x60 inches).
After haggling, I got the price down to $116. Reckon I should be able to get about 25 canvases of portraiture size at $4.60 a piece.
Nice to use, paint goes on well and has good coverage. No glare, no need for toning. Yellow pencil drawings contrast well. intend to glue to panels or stretch as needed.
All in all, cost and effort savings.