Sorry, but the title for most expensive AC compressor probably goes to my 87 Legend coupe. 3 different shops told me $850-950 rebuilt without clutch, depending on which one was installed on my car (they used 2 different compressors in 87!). So now the AC consists of lowering the windows - at least some of them anyway, as the master control switch doesn't allow the rt rear to lower. I replaced the switch for $250 parts and $75 labor a year ago and the part is broken again! So far my 300E has cost a small fraction of the bills on my Acura, almost as good as my Celica GTS.
87 300E, 65k miles