Cadburys chocolate fingers, normally £2.87 for the 450g box, down to £1.46. The 150g pack is £1.26, and the 300g pack is £2.15... so you get 3* as many for practically the price of a normal single box.
Spotted it in the Castlepoint branch, but there was a proper "Rollback" label on the shelf so it should be everywhere.
Asda Direct and George Vouchers: £5 - ASDA5, 10% - ASD10p