AIr Con Compressor A4 1.9 TDI

Guest
Where Can I buy an Air Con Compressor for my Car, other than Audi.
Audi wanted 750 vat (Fitting extra)
Another Audi dealer wanted £565 VAT. They are rip offs.
It is the electronic version I am trying to buy. Would buy a second hand one or get mine recon.
I am in the Essex area, can someone make a suggestion?

I am having great problems finding one. Done the usual search up and down the country, but to no avail.

HELP!
 
Let me know how you get on, I suspect mine needs replacing too. I've had it re-gassed but it still seems to be weak. I'm suprised that it has failed so soon. My car is only 4 years old. My wifes fiesta is 7 years old now and the air con is freeeeeezing and it's never even been re-gassed!