Saw this today as I scouted HMV looking for a few deals. Love Back to the Future and seriously considered getting one, until the Mrs. phoned saying she was hungry and that I had to get home with McDonalds in hand.
So, I missed out, however there were at least three in the Blackburn store, M and L sizes.
HMV.com has them listed as £9.99, but as the picture proves, £5 in store. Price will probably last until all stock is sold, so God knows what expiry date to put.
Further pictures of the item in Post 1.
Price comparison - £11.99 @ Play.com, £9.99 @ HMV.com.