its probably not just a bearing. in fact just replacing the compressor isn't wise either. the lines should be flushed, the dryer replaced and the expansion valve should be at least cleaned. compressors that have broken or worn out enough to make noise usually send metal particles through the whole system.
High pitched noise from a Toyota 4 Runner can be due to loose bearing. To check on this, touch each rim. One bearing will noticeably be hotter than the others.
I went on Ebay and found a tool that does the job in 15 minutes. It's listed under Rear Axle Bearing Puller Tool-09521-25011 Toyota Trucks.
its built into your a/c compressor if its failing replace the whole unit.
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