Sound good advice above.
Sadly, too many will never read, follow, or comprehend this. Then there is the impulse buyer.
Ebay, acording to news reports, is the largest used car "dealer" in the country. (USA). A little caution should be used when purchasing a used car off of eBay. I have purchased two. Both sellers "embellished" their description. One car I purchased had all new brakes. Unfortunately, the car had been sitting for more than a year and nothing would completely free up the brakes without a complete new brake job - all around. And although the tires looked close to new, all had dead spots and needed replacement. This one was an inexpensive Korean car. Home installed aftermarket radios can be a bust. This Korean car had one - and most of the wires came undone. This car was from a private sale. The second car was off eBay was from a dealer. Man, was that description embellished. It's amazing what a digital camera can do to a picture. There are many good honest people on eBay. Even so, they may not have the eyesight or knowledge to acuately describe the condition of a car. The best ones (and there are only a few) will state that if the car is not as advertised, you do not have to buy it.
An old friend (in the car business) stated to me once that there are three parts to a new car dealer. Sales of new cars - they, in the end, make little money. The service department is what pays the bills for the dealership. And USED CARS are where they make their best/most profit.
A good resource, might be at library or on www.abebooks.com
is a book titled: WHAT CAR DEALERS DON'T WANT YOU TO KNOW by Mark Eskeldson.
Some on this board are old hands at buying new and used cars while others don't have a clue.
I always laughed at people who traded in any car/truck. They state an inflated value that the dealership gave them. Example: If the MSRP (sticker price) is $25,000.00 and customer brings in an old broken clunker, and the dealership allows $2,000.00 for this old broken clunker, what really has the dealership given you for the old broken clunker? Certainly not $2,000.00. Yet, time and time again, I hear people brag about how much the dealer gave them for their trade-in. They just don't get it and may never get it.