Boots currently have an offer on Trevor Sorbie shampoo etc of 2 for £7. These are usually £4.49 each or more so a modest saving to be had there.
However, the current boots magazine has a coupon in it for 1 free trevor sorbie long hair product when you buy any other trevor sorbie product (non miniatures). This coupon seems to work with the 2 for £7 offer so takes off £4.49 to give a total of £2.51 (or less depending what you buy) for 2 bottles (although 1 has to be a long hair product).
The shampoo is a bit overpriced to start with but with this discount makes it not too bad.
The magazine is labelled July/August so may be withdrawn soon but the coupon is valid until 9th September.
This offer will only work instore.