I don't think people who sells car on that price range offer a free carfax. But don't depend on carfax either since carfax won't tell you whether the car have a rebuilt tranny or part like that. I think what you could do is test drive the car first and check all stuffs you like to check and if car satisfy your requirement then offer a seller that you will buy this car if..if he/she provide you free carfax report and carfax report should says what seller's been telling you about the car that the car don't have any accident or certain number of owners or certain mileage or tell them your not going to buy if carfax report doesn't match what you have been looking for.