Almost certainly ordered with stolen credit/debit cards because criminals can afford to sell at "a loss" since it's not their own money.
Exactly, this is just a form of credit card fraud, so BUYER BEWARE! If you really think getting a deal on a gift card is worth being on the tail end of credit card fraud then take your chances, but this guy will be laughing with btc in hand, and you will be the one who is traced to the crime...