Gear Linkage Box

[Quin452]

Hi guys

One of my Megane link cables (2-4-R) keeps slipping from its place under the bonnet, so it means that I have to stop the car and put it back in; I've tried using cable ties to hold it in place as a temporary solution, but these don't often last for too long.
My mechanic has quoted me £138.56 for the linkage box from Renault themselves and £110 for the labour.

I'm not surprised by the labour since the entire central column needs to come off, but the link cable box is a bit steep (being from Renault itself).

Is there anywhere cheaper for a new box? (because I don't want to pay £110 to find out it doesn't work)