The bearing is part of the 3 piece clutch assembly. You can unbolt
the compressor from the engine and change the clutch plate,pulley/bearing,and coil without disturbing the freon system.
Search this site for the PDF'd Factory Shop Manual for A/C clutch replacement. (It's a 2002 version, but the A/C is close enough to to show you how) Four bolts for compressor, one on the pulley center, and two snap rings. Piece of cake!!
Oh yeah, you need snap ring"pliers", the kind that expand the ring when you squeeze them. Certainly not $200-500 worth of garage labor!