Buy: You can BUY as many cars as you have in your budget.

Sell: You can SELL as many cars as you wish.(Amount may vary.)

Oregon is the state that cannot sell cars

Oh yes, they sell really small cars; they are called Smart Cars.

There are several resources to learn how to buy and sell cars. Some sources such as How to Buy and Sell Cars and What Smart Car Buyers Do are dedicated to learning how to buy and sell cars. Othe rsites such as the DMV and Wiki How have several articles dedicated on how to buy and sell cars.

Yes, a Pawn Shop can sell cars. A pawn shop can sell pretty much anything they want to (as long as it is legal). Some Pawn Shops will sell classic cars.