Boots are currently selling selected Toni & Guy hair products at 2 for £7.
I use the x-wax stick which is usually £8.99 each. Sometimes they do a '3 for 2' offer , but 2 for £7 seems to beat that by some margin!
I bought 4 in a local boots for £13.98 (don't know ehere the 2p went?!) it seems to be online too.
Not sure what else is in the offer but it may be worth a look.