Postcard Printer for Museums

This is Katie's idea, and I feel like maybe it exists, but I am too lazy to look it up:

You have been there before: you are at a museum, you love the exhibition, you want to get the catalogue or the postcard from the show - especially because you loved that ONE piece so much! It moved you. You want to be reminded of that feeling. In the giftshop there are three postcards, none of which are the ones you want. You see the catalogue, but the one piece you loved beyond measure is not part of it. You buy the catalogue anyway because you are a sucker. But what if you could print out - in the museum giftshop - your own postcards of the image you liked best? Like printing an image from an image search on the internet, but this one is all licensed, the museum and the owner of the image get support, and you get a decent print on nice cardstock (or paper).