I too was unable to find these "deals" Mark speaks of. I do not doubt them. I have heard of Manheim & another dealer resource that tells the actual selling price of previous cars. Mark is correct in getting a great idea of what your car is worth by asking the dealer what they will give for it on trade - of course you will have to add to that as the dealer will resell the car. But their trade in offer is basically wholesale. If you can buy a car for wholesale, hell yeah!
The CPO option cars are only available thru the McLaren dealers - they give you 2 years of unlimited mileage, bumper to bumper warranty along with unlimited roadside assistance for the same period. Not a bad deal given many of the early 2012's are on their final months of warranty. (headlights, paint, tail lights, etc. replaced under warranty.... not a bad deal, worth considering the extra cash considering the price of the parts, like headlights....)
My dealer did not know of an extended warranty option thru Mac when I bought mine a month or so ago. I would love to have an extended warranty, but I have 2 years to figure it out thanks to CPO.