A Wii system, wiifit disk and a Wii balance board. A couple of years ago a wii system could be found at thrift stores for like $10. They’re getting harder to find and go for around $40. You want one of the ones that has GameCube controller ports. The balance boards can still be found in piles at thrift stores for like $5. Wii fit disks are commonly still found in thrift stores for $3 or so. Wii systems are very hackable and you can do some cool things with them.