Adorama is currently selling Impossible Instant Labs for iPhone 4/4S and 5/5S for $199.99. They usually cost $299.99.
If you've not bumped into the Impossible Project's Instant Labs before now, they allow you to make polaroid-like photos from your iPhone. Instead of spraying ink onto paper, they use a photochemical process to produce an image. It's very much a digital-meets-analogue approach.