"This item is currently being modified. Please try again later."
I have been trying to purchase a book since Thursday (8-27-15) and I keep getting the same message: "This item is currently being modified. Please try again later." I have tried other books in the series and I get the same message. I can purchase other books but none in this particular series. Does it normally take 3+ days for a product to be modified? When will I be able to purchase these books?
iPad Air, iOS 8.4.1