Help to track down wallpaper to finish a room

[wazzow]

My sister bought this wallpaper from B&M (I know, I know!). Her son really liked it. She used more than she thought she would and now needs another roll or even a strip to finish the room.

Our local B&M don't have any more and said they won't be getting any. We don't have any packing for it either. We have tried calling other local stores, calling head office, local Facebook groups to see if anyone has any left, Ebay, Amazon, Googling etc. We cannot find it anywhere!

Can anyone help track it down for sale anywhere?