Wagner book out of print?
I was buying some books off Amazon and saw Wagner's book (Caterpillars of Eastern North America: A Guide to Identification and Natural History) as a suggestion. The price of $53.78 surprised me (list is $29.99). Looked and found that the next lowest price is $113.95. Wow! Looked around at other book sites and saw that $50+ was the going rate for a new book. Did find that one seller seems to be able to sell them for $26 on Ebay when he/she has them available.
If you want a copy or a second copy, I suggest keeping an eye out for the cheap copies on Ebay.