Looking to buy a vintage Leica M3 rangefinder camera? You can expect to pay at least $1,000 on eBay for one in decent condition. Unless you intend to just put it on a shelf as room decor. In that case, this Leica M3 replica tin looks convincing enough from a distance, and it will only cost you $40.
Unfortunately, mini Leica cams don't exist, but Minox has made this beautiful digital point and shoot, which is about a third the size of the retro cams it takes its inspiration from, such as the Leica M3.