Because it is officially sold out, completely, according to Jake Bannon.
No left overs exist.
The releases is 100% sold out, all versions.
Auction sites, trading, or a possible retail store is your only option for acquiring one.
That was from a post earlier today on the Vinyl Collective message boards. Happy hunting on eBay, Limited Pressing, Dead Format or wherever you do your auction buys/work out trades.