Was in Asda earlier and noticed they have boxes of 36 tablets, states 18 washes but I only use 1 tablet per wash so 36 washes for £2. They had:
2in1 - Moonflower and Ylang Ylang
an orange one that doesn't seem to be showing online.
Online is showing sesitive and colour ranges as well.
Works out at 11p a wash if you do 18 (using 2 tablets a time) or 5p per wash for 36 (using 1 tablet per time).