While trying to locate a site for MicroPix (curiously, I cannot find one -- I'll keep looking), I stumbled across this page for an outfit called the
Crimson Atelier. You might want to look into it.
There was a time when you had to invest thousands of dollars and wind up with dozens or hundreds of reproductions. Now for a relatively modest set-up fee, you can get as few as one print (MicroPix) or 15 (Crimson Atelier). At MicroPix (assuming they're still around!), you can then just contact them to purchase as many additional prints as you want, when you want them.