As Baz says above, Paul quoted £95 for theses sights, in the white, so just need blueing. He only made a small batch, so if anyone needs one they shouldn't hang about.
Last price I saw quoted by Knibbs was £140, and that was some time ago.
I just spoke top Paul for some MK2 series 1 sights and they are in production http://www.airgunbbs.com/images/icons/icon14.png