In addition to the domesticated potato, there are many wild species that are native to both North and South America.  I offer wild potato seeds and in vitro plantlets in small quantities on an irregular schedule.  I grow wild potatoes because I am interested in them, not because they sell well, so it is quite likely that what you find in stock in any given year will not be available again for three or four years once it sells out.  Seeds are generally produced from collections made in a variety of places, representing the overall diversity found in that species.  Most wild species are used for breeding or grown as curiosities, but not for food, due to their small size, long stolons, and often high glycoalkaloid content.  Some are worth trying as ornamentals.