According to Redditor L064N, he was shopping at a thrift store in Oceanside, California last week when he came across a very strange Atari console. Some quick Googling told him it was a rare prototype for the Atari 2700, an un-produced wireless follow-up to the 2600. He bought it for $30.
Source: Gizmodo – Super Rare Atari 2700 Found At California Thrift Store