The car talk web site used to have an area where visitors to the site could recommend mechanics. You could look and see if any are listed in your area. Of course, there’s nothing preventing Joe Bob the really bad mechanic from having his brother sign onto the site and giving him a glowing recommendation, but you might want to look into it.
Mechanics do this sort of thing all the time. Just call one up and say hey I’d like you to evaluate this car I’m thinking of buying, what do you charge? Given the typical hourly rate of mechanics, the price range that Shagnasty posted is about what I’d expect too, maybe a bit cheaper.
If you do a google search for “used car tips” you can find a lot of advice.
When I look at a car, I look at the following:
Look under the wheel wells. If they are really rusty, the car overall hasn’t been taken good care of. Immediately walk away.
Stand at the back of the car. Look down the left side of the car. Now look down the right side of the car, comparing the lines with what you saw on the left side. They should match up. If they don’t, the car was likely in a bad accident and repaired. Walk away from this one too.
Open up the radiator cap (make sure the car is cold and hasn’t been run lately or you’ll burn yourself!!!). If there’s oil in the radiator, chances are the head gasket was blown in the engine. If they are up front about telling you that the engine was recently replaced or something then maybe you can keep going, otherwise walk away.
Check the oil. If it’s black and thick, the engine hasn’t been well maintained. Anything other than nice, reasonably clean oil is a bad sign.
Listen for any odd ticks or funny noises coming from the engine.
If the car fails any of these simple and quick tests, don’t bother taking it to the mechanic for evaluation.