Soft top replacement window ?????

[xkatierosex]

Hi folks,
I have came up against a brick wall and would be grateful if someone could point me in the right direction
I have a Renault Megane Cabriolet 2010 and the plastic window at the back needs replaced.
Dealers I am sure can do the job...with a price tag to match!
Ebay have people that sell and fit them for around £150, but the problem is that I am in Northern Ireland.
Can anybody help a damsil in distress??? lol