Tesco currently have Finish dishwasher cleaners reduced at 2 for £4.00.
They have a voucher to get £2.50 off your next purchase of Quantum tablets. They are valid for 24, 36 and 48 packs but they work with the 12 packs too.
But, the 12 packs have 12 free so you get 24 tablets for 3.48. use the voucher when you come to pay and you get £2.50 knocked off.
So for just under £5, you get 24 QUANTUM tablets and 2 finish dishwasher cleaners.
I have done this twice and I hope it helps someone else to.