Hi! Guys, can someone tell me what would be fair price for used, but good cond Disco1 gearbox in UK? Is any one here who would like to sell one? K.r. ;)

Hi everyone! My first post here. I'm not from UK so pardon me if I the grammar is slightly wrong. ;) Finding gears on my Discovery Tdi200 is beginning to look like fishing - I know it's somewhere there but it needs patience and luck to find it. :) Local workshops are not too keen to fix it. So...