GameStop has in fact started sending out keys to those who took advantage of its Gat out of Hell price error.
According to various reports from users on NeoGAF and other message boards, retailer GameStop has decided to honour its $5 price for Gat Out of Hell.
Multiple users have reported receiving their codes.
This follows a comment made by Deep Silver PR on Monday that suggested GameStop will not honour those orders.
The price has now gone back up to $20, the DLC’s actual RRP.