I have created an account at Fine Art America, an online portal that offers print-on-demand reproductions in a range of sizes and formats. You can order prints on paper, canvas, clear acrylic sheets, metal, and wood. Size options range from 8" to 48" in most cases. They will produce the print (and mount or frame it) and ship it within 2-3 business days.
I'm starting with a set of my five favorite paintings, and will continue to upload more as I have them professionally digitized - high resolution files are required for good quality large prints.
Prints are currently available for all of the paintings shown in this blog entry.