Where to fit Central Locking for a Mk IV Golf?

[sjmills]

Hi,
I purchased a Golf Final Edition earlier in the year - unfortunately it comes without Central Locking...

I need to get the Central locking fitted now - VW will charge about 500-600 to fit central locking to the car - does anyone know of a reputable company that will fit a quality central locking kit cheaper than VW?

Thanks
Stephen.