There are several possible reasons why these are going so cheap. Newer models go up to 520 Mhz, so they are last year's model. Who knows, maybe they are from a container that was unclaimed freight or had been damaged in shipment, and were auctioned off by the insurance company. A lot of manufacturers overbuild things expecting big orders, and when they don't come they end up dumping them on the surplus market. There are a lot of legit reasons for the low pricing.
BTW - the "only one left" thing is just an inducement for people who are sitting on the fence to make the decision to buy. Four months ago I bought a set of fender flares for my truck from a seller in Thailand. The ad said only one left. He is still selling them and still says only one left.
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Agreed about the inducement to buy by claiming there is only one left. that seems to be an old tried and true trick.