I wouldn't expect many responses to your question, maybe it is better to rephrase it.  Google buying used WRX and find a good primer on what to look for/what to avoid.  

Try your best to find a stock car with all maintenance history - this is your best bet.  

Unfortunately your question is like "I am flipping a coin, what side will it land on?".

Do you mean a car lot that only deals in used vehicles? Or just anywhere that sells used vehicles?

Has anyone bought a WRX (looking for an 09-'12) from a used car lot? If so what was your experience like? 

Question about buying a wrx!