Purchased two hellfire ring recipe book by mistake, obviously i cant resell it to npc for 2m, nor list in on AH for 1.9m. this was purely unintentional mistake and i totally admit it is my fault to purchase this two times, no matter how word it.

but there was no warning message, or no point of allowing duplicate purchase if all there is i can do to this duplicated book is delete it along with my 2m. is ther eanyways i can get the 2m returned? and things like account-bound unsell-able unauctionhouseable items to be only allowed to purchase once?