A couple of cheap Gollancz fantasy books at Amazon UK:
The Adamantine Palace by Stephen Deas, £1.49 - I paid full agency rate for this one and liked it a lot. It's more about political machinations than a straight-up epic fantasy, and it's the first in a series. I have the second and third books but haven't read them yet.
Tome of the Undergates by Sam Sykes, also £1.49 - I haven't read this one, and don't know much about it.
I've just had a quick look on kobo, and they seem to have the same prices, so it doesn't appear to be amazon-specific.