Six tins of SlimFast for £23.90 delivered from Superdrug.
You also get a free tote bag.
A few offers stack to give this price. You also need to be a Superdrug member.
Topcashback gives 2.02% cashback. You also get 69 points (worth 69p off your next order).
I know these shakes aren't for everyone, but this seems a good price.
Offer is on until Monday 22nd.
Hope this helps someone.