Just wanted to update this cool thread, and put another on the table.
As I go through completing my Warren Eerie run I'm finding out that its actually quite tough to find Eeries in high grade numbered in the 20's . 22,23,25,29 are the toughest. Oh yes you might find them, but high grade is a whole different animal.
Here I thought 17 was going to be the white elephant, but #23 took me over 2 years.
#22 was brutal in finding a clean white cover with no creases, or spine ticks that move to the back of the book.
And forget it #25 is insanely tough, still looking for that one.