Kiipix Instax Mini Printer, bought from Amazon for about $32 including shipping. I became aware of this through a post in the Worldwide Instax Shooters group on Facebook. This is a pretty neat gadget that prints photos from your smartphone onto Instax Mini film without using batteries. It folds up into a somewhat compact package that can be carried in a bag for on-the-go fun.
After opening the Kiipix, place the phone frame on your smartphone and resize and compose your photo on your phone in the opening. After composing your frame, place your smartphone with phone frame attached (it uses a removable adhesive) face down on the Kiipix stand. Press the shutter button on the Kiipix and wind the nob to eject the Instax Mini print. Multiple exposures are possible by pressing the shutter button multiple times before ejecting the film print.
It comes in several colors. I think it works really well and can be a budget-friendly option for printing Instax Mini photos from your phone. Holga is launching a similar product on Kickstarter with a companion app.