when buy a car?

Hi by all!
I want to buy the cheap used car online, will not prompt where better to buy used car, help by advice on purchase of the car. I meet with purchase cheap used car the first time, and the help on purchase of the car is necessary.
I want to buy used car in Chicago. Has stopped the choice by these used car:
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Whether there are any auctions for purchase of the used car?

Has found some more sites on purchase of car. Whether how think it is necessary by it to trust?
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By all thank for the answers!