I've never done Canvas but I was really happy with this places pricing. Like $40 bucks or so for big prints. It's been a while "and I'm old" as I'm constantly reminded on this fvcking forum but.

some of my prints I think they are only 30" tall
Available Media and Pricing

 

I've used Posterdog.com several times, and am really pleased.

 

I used Canvas on Demand a few times now and they have great service at a great price. If you sign up as a "Pro" (just takes a website) they gave me a nice size one for free for signing up. They email deals every month as well.

If your oder is over $200.00 try coupon code "THANKS60" for $60.00 off. It says it has expired a couple weeks ago, but they are known for not turning off their codes.

If you do have a photo site and think you can convence them you are a pro then sign up here:
Canvas On Demand Pro