Westerns can be found at anything from around £30 to £100, depending on where you go. Clearly shops will be more expensive than a private breeder, and it does also vary around the country.
Tri-colours are usually £150, I certainly have never seen them any cheaper, and that is usually the price that private breeders sell them at.

Yes Schip does breed them, hognose are all I have now due to my total addiction and love of these ugly little snakes lol.

Tri's average £150 private or shop seller whilst Westerns can start at £40 and work their way upwards via private sale and again more with the shops.