Michael is looking at mobile photo printers. He hears that the HP Spocket is pretty good. Leo says that the Sprocket is an instant printer, similar to a Polaroid. It's called Dye-sublimation. Polaroid makes a mobile photo printer called the Zip, and Canon makes one that is a big larger called the Selphy. These aren't cheap: it's about $0.50 to $1 per print for consumables. These are fun for parties, though. They're also rather small, at only 2"x3".
Another printing solution is Chatbooks.com, which is $8 to make a hard cover book with 60 images from Instagram in it.
For even more options, Leo recommends checking out this article from Popsugar.