Hi! Unless you've got a hairdresser friend who can buy them at trade price, it seems individual sachets are quite expensive to buy. I've seen Jerome Russell B blonde which aren't expensive, but they aren't very good in my opinion. Wella are always good and i have seen them on ebay and Amazon but usually at around £2.50 + per sachet. I've got a tub of Igora bleach and it's the best I've used.