I replaced mine last year in my '08. I found a complete kit on Amazon. I think they are on eBay too. It came with compressor, orings, oil, expansion valve and desiccate sock for under $300. I had to buy some R134a and a new desiccant sock cap on the condenser plus a can of AC flush. I also got some gauges.
It was the first time I ever did AC work. Took the whole thing apart except the evaporator.
New AC Compressor & Clutch With Complete A/C Repair Kit For Hyundai Accent