I just ran across this link and thought I would pass it on to you all. They are regularly $100 / pair, and are going for $29.80 / pair. Here is the description they give of this product:
"Want to feel your music? The Bass Shaker Plus and Bass Shaker products allow you to experience every thump, thrust and shake...the way bass sound was originally intended. Aura's patented technology preserves the sound pressure levels so there's no distortion while enhancing the bass energy delivered from your stereo. We're taking surround sound to another level.....
Bass Shakers from Aura Systems add the exciting dimension of feeling to the sights and sounds of video arcade games, movies, stage shows and multimedia attractions! By actively converting bass sound waves into spine-ringling vibrations, Bass Shakers turn entertainment into a "moving experience"!
Bass Shakers bring coin-operated video arcade games to life by transforming a game's audio output into body-pulsing vibrations. With Bass Shakers installed into arcade seats or floor platforms, players can feel everything froma fighter's punch to the roaring engine of a formula one race car.
In movie theaters, the action jumps off the screen, the soundtrack comes to life and the entire experience is intensified. Bass Shakers hook up like a speaker and easily mount directly to a standard theater seat.
Installed in seats, tables, booths, floors of showrooms and stage theaters, Bass Shakers provide audiences with a more complete entertainment experience. Las Vegas stage extravaganzas, hit Broadway musicals, and rockin' concerts virtually jump off the stage into the audience. Bass Shakers are ideal for bringing music, on-stage special effects and laser shows to life."
Here's the link for those who are interested:
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=299-027