Saw this posted at hotdeals: "PartsExpress.com offers the Aura Bass Shakers at $29.80 per pair. It's the best price we've seen by $40. Add around $9 for shipping. Aura Bass Shakers are actuators that can be mounted on surfaces, such as seats or platforms, to recreate the rumble of low bass notes." Just thought I'd mention it. Good luck!! Chet_F P.S. Think these can be powered from a 25 watt amplifier?