I recently bought the whole window regulator, which is the whole lifting mechanise including motor and Temic control module for £204 including the vat from my local Renault dealer. Considering the amount of time I had been messing around to try and get what was an 11 year old system to work properly, I thought it was good value, especially since Renault would charge most of that for the motor and controller.
You also want to take a look at the door switches, as the contacts oxidise over time making the contact erratic. I took the switch apart and cleaned everything up. Which made a huge difference to the control.