Cost of compressor for 2004 Buick Lesabre Custom?

Hello, we have a 2004 Buick Lesabre Custom. The first hot day, my husband turned on the air, doesn't work. After eliminating just about everything, he figures it's the compressor. Doesn't work at all. Anyone have a ball park how much it will cost to have it replaced by a mechanic?Cost of compressor for 2004 Buick Lesabre Custom?used about 125.00Cost of compressor for 2004 Buick Lesabre Custom?autozone.com gd lk