2000 Honda Civic A/C compressor?

Last summer I had my A/C flushed and refilled, however it did NOT fix my problem. My A/C worked intermitaently for a while and now it is completely broken. Recently, a mechanic told me that it looks like the compressor is not working. What should I do? And how much should I expect to pay to get the entire A/C up and running? Should I get it fixed at a Honda dealership or by a local mechanic. It's too hot in Georgia to ride with my windows down. Help! Thank you in advance for your advice...