Just been to ASDA (Sandal) to do my usual shop and they had large plastic packs containing:
2 x Finish Dishwasher Cleaner Lemon (250ml each)
2 x Finish Dishwasher Freshener Lemon & Lime
For only £2.50 the lot (were £5)
Individually these dishwasher cleaners range from £3.40-80 each and the fresheners £2.00 each.
Quite a saving!
Can't find online so only instore