I got it at my local shop, but I paid like 210 or 230 out the door for my rear sprocket and the chain and the install. Sprocket was machined to fit as well. I think the chain was like 140. but It was a while back.
this is not a place to go cheap it is not worth it, also if you dont have the tools, like said before bring it to the dealer, it will be cheaper in the long run. THis job is near impossible to do it right with out the tools. you are buying sprockets too right?