Compressor for air condition system
 

Can anyone help
i have a vw golf gt fsi 2lt 2004 and the air con compressor is faulty
having called in a specialist guy who told me the compressor was faulty and needed a new one costing £500 what a bombshell !!!
could i pick up a second hand one and if so does anyone know where i could aquire one the engineer said not to entertain a refurbished unit or a second hand one but i cant afford £500 right now.
would really appreciate any help anyone can give or just some advice

many thanks

ron