We have a lot of ways on how to choose a good car before we buy. Some of us will go directly to our local car dealer and some also will search on the internet for a best car to buy. Nowadays, lots of car auction sites offers low car prices but we don't know the real condition of the car.
Don't look for cheapest car. When it comes to used cars, "best deal" doesn't mean the cheapest one. Your goal is to look for a car in good condition for reasonable price. If you choosing between relatively cheap car that might have an accident in the past or was poorly maintained, needs some repair, etc. and more expensive one that is in excellent condition, I'd without a doubt choose the more expensive one. You will simply save on repairs and will have less troubles driving it.
Don't think they sell it cheap because they don't know the price or they simply want to clear their inventory. If they sell it cheap, definitely there is something wrong with it. Remember, proper price for a certain used vehicle is not the one indicated in blue or black book - they give you just an average price.
The actual vehicle value big time depends on a car condition. Two cars may only look the same. One may have been maintained so poorly and the engine won't last long after you buy it. Previous owner of another vehicle may have been religious about maintenance, was using only synthetic oil, has done the rustproof and so on. Without a doubt, I'd rather pay $2000 more for this second car just to have peace of mind driving it.
So next time you buy used cars, know first it's value and pricing before you make a deal with your car dealer.