For those not aware, I have books and videogames for sale at Half.com: http://shops.half.ebay.com/jlandrith
Most (not all) of my books in the half.com store are brand new (never been read) single subject encyclopedias, sent in hopes of a review by my wife in the magazine she formerly edited. Most of the encyclopedia prices are slashed down to about 30% of the list price that you'll find in a brick and mortar bookstore. Check it out, maybe you'll find something in your area of interest.
I thank you in advance for your patronage.