Rolo cookies from the Tesco bakery are half price at just 44p a bag (for 5 big cookies).
Smarties cookies (bag of 6) are also on offer at 55p.
This was spotted in the Bury St Edmunds store but probably nationwide as it had the proper shelf labels on.
P.S Sorry, can't get images to work on this computer!
Edit: Thanks to whoever added the image! :)