Check out with your mechanic.

If you're satisfied with your personal inspection on the car then decide whether you want to purchase or not, if you decide to purchase then this is the time to call in the professional to inspect it. Of course, you should stipulate to the seller that the sale is contingent upon the inspection.

Things a mechanic should inspect are :-

General mechanics.
Body work, including paint and frame.
Odometer fraud.
Proper trim options and features.

Steps to buy a Cheap Used Car

How much is your spending limit?
Inquire about your options.
Test drive the seller.
Test drive the car.
Personally examine the car.
Check it out with your mechanic.

How do I get the best deal?

Arrange your financing first.
Bargain based on the car's value.
Keep things simple and separate.