Just back from Sainsbury's in Luton ( Bramingham Park). Soon needed to renew Office 365 subscription and saw it on the shelf for £12.50.
On going through the self scan checkouts it went through at a penny! (Will add receipt to first comment... bit slow...actually 7th comment!). Verified with staff and they checked and said a penny is correct!
I apologise in advance for any wild goose chases.. appreciate that this might be store specific. However I think that £12.50 is a good price (hence putting it up at that price)... but a penny seems crazy. I went back and picked up a few more copies and left 2 on the shelf. Although after chatting with the staff, think that they may well have had them!