How much should it cost to replace my ac compressor?

You can get that estimate here www.repairpal.com/estimator

you need to repl the complete a/c system. compressor accumulater and orfice tube with labor approx cost 1100. 00

Globalhelper is correct. His recommendation is the only way to perform this repair. Where ever you have this job done make sure they warranty the repair for at least one year. You most likely have a evaporator leak also.