Man, many of those books ended very low. I know some aren't the most sought after covers but many of those were deals.
Thanks man. If I can find a way to display them all at once that would be awesome. I'd likely have to take over my daughter's room, but she's only 4 so she can't put up too much of a fight... ;)
So, cover proofs..... What companies do (or did, and what Cole did often and keep them) was they'd have the printing company print off a copy of the cover to an upcoming comic - just the cover before printing. So they are on slick, thin, slightly glossy paper and the colors really shine. It was to get an idea of what the cover would look like before actually going to print. Sometimes they would make more than 1 per issue and sometimes they'd end up making some of books that never got printed. There are a few of these you can find on the net or in the Cole Blacklight book. Cole kept many of these in his files and many of them went up for auction around a decade ago. Search ComicConnect and you'll find them.
I actually have a few pre-printed versions of modern comics that served the same purpose but are a bit different. So companies still do similar things, they just aren't as cool.