They never caught on like the HWs, but in good condition your probably looking at around the £120/140 mark if it all works well and unblemished. I will stress "good", as in lesser condition it costs a lot to bring them up to standard and they go for considerably less
I'll just add - the breach locking mechanism and the triggers are the weak points, you can sort the breach locking but it's a pain in the ass, the triggers can only really be fettled polished and are single stage, so never going to be great - but for the price it's what is reasonable to expect.
James