A/C compressor bearings

My a/c compressor bearing burned out and, naturally, the clutch assembly is pretty fragged. I haven't noticed any leaking from the vehicle but I did inspect underneath the a/c system and found residue of leakage. The pulley will not turn at all with the engine turned off and makes a grinding sound when I start the engine. Do I need to replace my entire a/c system or is there a more cost effective way to get this fixed?