Maybe the older stuff is scarce, but there are plenty of 360's out there. Probably a few less than same time last year but still plenty. I tend to think all this stuff is for sale all the time, you just have to ask and negotiate. My boats not for sale, but I would sell it.
F430's were a bit thin for a while with mainly tossers wanting $250k for a 2006 model with 30,ooo clicks on it. Some of the asking prices by dealers make me laugh. But maybe they have some gun salesmen. Would not work on me. I can say NO in 7 languages including Chinese.
You have to get real if you want to sell. A 2008 Red/Tan F430 in good nick with sub 20K on the clock is about $210,000 if you are realistic about moving it. Ask $240,000 and you will still be there in 12 months and it will then be worth less. Ask $220k and sell it for around $210k in less than 6 weeks. As the Meerkat says "seemple".
I read a report about a year ago about the price people put on their houses, and their justification for their price. The guy doing the report was some Physc guy doing some PHD or similar. He narrowed it down to the fact they thought their house was worth more because it was "theirs". Now that is amazing!
It's a great question to ask someone - "why do you think your F430 is worth $240,000? when the current wholesale price is $185,000". Now they will know that, as they have already tried to sell it to a dealer and had a minor heart attack when they were told the price. The dumbness of smart people often leaves me speechless.
Now plenty of people out there will go "no-way, you will buy them much cheaper than that"...blah...blah. But if you want a really neat, low Km, straight well cared for car then you will pay a little bit more, but it will be better "value". I usually find that value for money is better than cheap.