Just been to Tesco to get a few bits and needed dishwasher tablets.
They had Finish Powerball tablets for £4.89 for a pack of 42, works out at less than 12p per tablet. In original and lemon scents. This price is 50% off until 23rd June. Picked up 3 boxes today.
They are 3 smaller boxes of 14 bound together and are the type that you don't need to unwrap.
Seemed like a good deal compared to the other packs they were selling (there are offers on Fairy tablets too but I have always found these to be the better brand, each to their own though).
Shows online too.