6 boxes of Superdrug Slenderplan (their version of Slimfast) for £15.35 delivered.
A few offers stack to get this price, plus you get a free tote bag.
You need to be a Superdrug card member to get it down to this price. You will also get 45 points (45p) off your next order.
Topcashback gets you 2.02% cash back.
I know these shakes aren't for everyone, but these are really cheap if you are currently using them.
Ends on Monday (22nd).
Hope this helps someone.