On standard photo paper, both Mpix(
http://mpix.com/ ) and White House Custom Color (
http://whcc.com/ ) will do it for $15.00-18.00 depending on surface. If you want fine art paper, the costs are way higher.
Those are the two labs I've seen mentioned positively most often, I do my own printing so can't be of too much help, I'm afraid.
HTH,
Bill