A started dog at the level you describe will cost about $4000. That will get you a dog that is obedience trained, force fetched, collar conditioned, and started on simple marks. Usually around the age of 10 months to a year old. I would suggest you visit this website
http://www.tbirdlabs.com/ Mike specializes in started dogs for upland and waterfowl hunting. His dogs are well bred. You can see pics of the started dogs he sold last fall. But as David said, your going to have to spend some money.
You can go to the retriever forum and find lots of started dogs. They are generally for sale because there is something about the dog that the owner doesn't like. So they try and re-coop some money and start all over with another puppy. My advise, is don't buy one from that forum. I think TBird labs will have what you want but again, your going to have to spend a little.