I would search ebay's completed auctions and find a car you like that didn't sell. Send the seller an email asking his best price as you are a serious cash buyer. When if he send you a reply, Tell him "I mean you no disrespect but that is kind of high, I was thinking more of the lines $xx,xxx (lowball him). Just be prepared to get a yes. Its amazing. Cali buyers (most not all) are getting pretty desperate for cash. Their state is a mess.
You can also bid on the cars on ebay but not too high. The seller may give you a second chance offer if his reserve isn't met. That is how I got mine
Ps it doesn't work as well with "Dealers" And don't pay too much attention to buyit now prices as 90% of the boxster don't sell.