This is a great idea. I have a tight relationship with the printer I use at <a href="http://www.cheergram.com" rel="nofollow">http://www.cheergram.com</a> and we are thinking of doing something similar.<p>I know several pro print labs and Lob's prices are a bit high. On the other hand, small run printing can be a pain. Most printers I know have minimum orders on photo prints and press products like cards have to be done in groups of 25 or 100. Also, most printers will ship to their client for free but charge a fee to drop-ship.<p>All-in-all, the pricing isn't terrible but you have to find some kind of specialty/niche to make it work. I don't think you could do much with just a basic "print this thing" service built on top of this.<p>Here's one lab I know of that actually publishes their pricing:
<a href="http://www.nationsphotolab.com/prints.aspx" rel="nofollow">http://www.nationsphotolab.com/prints.aspx</a>