I don't think there is. Selling things for your own profit without purchasing an ad from the site owner could get you banned for advertising.
I sell all my used/previously loved books to a store called Half-Priced Books. I don't get much for them but my goal is to clear the clutter not make a buck.
As for the weapons, try going to a gun show (depending upon where you live of course) and sell them to a collector there. It sounds unlikely, but I bought a sword from a gentleman at a gun show for around $60. It's worth a shot. Who knows, he/she might be interested in the books and tapes as well.
"It has been said that politics is the second oldest profession. I have learned that it bears a striking resemblance to the first."- Ronald Reagan