I have a copy of the Overstreet Price Guide #11 from 1980 I'd be willing to sell for $25 (cover price in 1980 was $10). It is in pristine condition, and has never been opened. There are 2 very minor creases on the upper front and back cover, but they don't break the color in any way. The cover is by L.B. Cole, and inside there are 3 full-color reproductions he did, as well as 33 full-color covers he did.
If you're interested, please PM or reply here. For comparison, here's this issue on Ebay right now.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=378&item=6902802416&rd=1&ssPageName=WD1V