Today's "gilcee" prints are really high
quality digital prints on archival papers. The quality of the product depends upon the quality of your digital image that you use to be printed. One place to look and order these prints is: www.iprintfromhome.com
If you have any questions, you can call them and they are very helpful. They also have a lot of information on the process right on their website. The image size you get from them can be full size or something that is proportioned correctly to that exact size. They also have various qualities of paper from which you can choose.
You might also inquire in your area for a photographer that has the right equipment, and does this process. I've used both a local and iprintfromhome.