and all original accessories will be very expensive these days. Looking at current prices for the individual models, $5000 to $6000 delivered would be a fair price. That is a lot of $$ to blow on diecast. There are buyers out there though. I would pay close to that much if I didn't have them all already.

So, your options are really limited - wait for a right buyer, sell individually on eBay, or sell cheap(er) to facilitate sale. Heck, even I would get another set for the right price. Let me know.