Might be of use to some, especially if you want to run some smoking/ curing/ rilette trials (like me).
Morrisons fresh fish counters have salmon at £3.99/kg. Think it runs until Sunday 14/12/14.
They'll fillet it for you as well if you're not comfortable with it.
You pay for the whole fish but they'll give you the head, spine & cuttings if you want it (you've paid for it after all).