I have used Imagekind in the past. I liked the results.
https://www.imagekind.com/art/custom-canvas
Britt
Kelly, Fine
Art America offers canvas prints but I've never purchased one so I can't speak to the quality.
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Emily S. Damstra
natural science illustration
Guelph, Ontario
(519) 616-3654
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emilydamstra.com
@EmilyDamstra