2 ways to look at this.
Good examples are rare because the owners of nice stuff generally know there isn't anywhere obvious to go from where they are. So their prices are holding up well. For example I could still get £150k for my 2002 TB20GT and this is from private feedback, not advertised prices.
The common stuff is going to fall a lot more, but owners will be in denial for as long as possible. Those hard pressed will sell at a very low price. Some dealers in the USA are contacting owners (out of a database) making them silly low offers, and it seems to work because at any time a certain % of owners are in dire straits financially.
The drawback of buying something "in distress" is that it is likely that maintenance has been bodged for the last few years.
The actual price paid is never advertised because once you advertise say a 30% drop then the whole market is marked down and you will be getting offers 30% below the new figure
Just like houses, right now, really