I'm just saying, you can buy an unsigned red for $10, in case you're looking to fill out your collection. There are a lot of them out there.
The Blue pops up now and then, I've seen a couple go for under $20 recently.
The Black Trapps was going for about $100 for a while, but it's dropped now that the Grey Trapps is out. Still not cheap, you can find it for under $40. The Nears and Skytop books are easy to find.
I've seen the Gran on sale for over $600, maybe Chessler reduced the price recently as it was there for a couple of years.