I picked up Kareem Abdul-Jabbar's book A Season on the Reservation at the used bookstore. It was priced at a dollar but I had a 15% off coupon so it only cost me 85 cents! Not bad considering signed copies of this book are selling for around $75 online.
I also picked up a couple of other signed books: Another signed copy of Roy Firestone's Up Close, and a book on the 1998 USA Women's Olympic Hockey Team called Crashing the Net. Unfortunately it appears that signed copies of Up Close are fairly inexpensive online, so I doubt I can sell it. As far as Crashing the Net, it is signed by the author, who I mistakenly thought was a player on the team but is not. Shows you how much I know about women's hockey.