Where to find dropship apps for large canvas prints?

[bendellaine8]

Hi guys!  I am a photographic designer in a very niche market and am building my first shopify dropship website.  I want to produce large canvas prints with my artwork but can't seem to find an app that works with shopify to support my needs.  Printful and Printify and other Canvas print companies I have researched only go up to 24"x30". I'm looking to do Canvas prints of 30"x40" and larger.  Can anyone point me in the right direction?

thanks in advance.