It's so sad this thing is $50, because I don't think there's anything that comes close to being the same size. While a subjective conclusion, I think the SD car

It's so sad this thing is $50, because I don't think there's anything that comes close to being the same size. While a subjective conclusion, I think the SD card version is cute (for example, https://wi-images.condecdn.net/image/7aDlgBynO8X/crop/1620/landscape https://wi-images.condecdn.net/image/7aDlgBynO8X/crop/1620/l... and http://cdn1.alphr.com/sites/alphr/files/images/dir_414/it_photo_207253.jpg http://cdn1.alphr.com/sites/alphr/files/images/dir_414/it_ph...). That said, once attached to the necessary peripherals, overall size would increase, which is sort of annoying, and makes the price tag even more irritating. FWIW, there was a small craze of Wi-Fi SD cards a few months/years ago, and the Linux systems on (one of?) those was reverse-engineered to some extent. IIRC with one of them you could only connect to it via Wi-Fi (which generally isn't 100.00% reliable); the SD pins proved too difficult to commandeer.