Here's a rather interesting piece of highly specific transforming furniture: The Human Hoist, which is designed to go from rolling chair to floor-level mechanic's creeper. Your average consumer will have no use for it, but for a grease monkey with no hydraulic lift, it provides a quick way to get from under the car to the toolchest and back again. Check it out (and lower your speakers if you're at work, annoying soundtrack ahead):
There's no word on what the thing would cost, as it's currently just a prototype. Whoever's behind the product has announced they're "actively looking for potential investment and/or [a] manufacturer to produce The Human Hoist," but their website has absolutely no useful information.