I would never spend $80 on something from a vending machine! For tha amount of money, you really need to be able to properly see and even touch the thing your buying. Caveat emptor
2) Amazon customer service is awesome, I experienced this first hand at xmas when my little boys 3DS wasn't charging properly, I emailed customer service to send a new charger and they just sent a whole new device and give me 28 days to return the other one.
That is what I call customer service
That said, other than the novelty of it, there's no reason to buy electronics this way.
You need something, they are selling it, you buy it