Not a huge money saving deal but if you`re passing a Boots and have an Advantage Card, put it in the automated machines (at big stores) and get a free voucher for a small tube/bottle of hair-care product from Toni&Guy, Trevor Sorbie or someone else (I haven`t got enough hair to be into these things in a big way!). Just take voucher and product to till to get it free.
Bottles are 50 mL and should cost around £1.50 to £2 ish - includes shampoo, fancy conditioners and all that gubbins. The missus liked it anyway.
Stumbled across this in the Leeds store today.