Came across this option and thought it might be interesting to those considering a DIY photobooth! Hema, which is a Dutch chain that apparently now also has shops in the UK, is selling Instax Mini 8 cameras for 65 pounds, way cheaper than I've seen them on Amazon etc. And if you happen to be traveling to the continent any time soon, it's 65 euros so that's even less! They also have the smartphone-printer and the film.
http://www.hemashop.com/gb/shop?searchtext=instax&searchlocation=%2F%2Fgbhema%2Fen_GB%2Fpgb_product_type%3E{books%3Bexoot%3Bshop}
I'm considering getting it for people to stick photos in the guestbook, but not sure how well it would work if they are left to themselves with it... Did anyone do a DIY polaroid photo booth? Did it work well? How many shots did you provide/use?