Compressors are RENOUND for being pricey... for NO reason!
My previous car's compressor went (SEAT Leon Smoker) ... the stealers wanted like £1500 for it... AND fitting on top!
I went to my "kind of local" Air-Con place in Brum. Cost me £700 all in. Including compressor, re-gas, service, filters AND labour!
I'd be ringing round my local places if I were you
Find out the part number first mind