http://www.walmart.com/ip/Kicker-PT250-10-Subwoofer-with-Built-In-100W-Amplifier/32983978
I installed one of these in my truck last spring. Works great, took me about 2 hrs to install ( I am anal when it comes to wiring ) and never looked back.. Love it, sounds great, fits under the rear seat in my truck ( pass rear ) and screwed the remote infront of the center jump seat. I recently upgraded my head unit ( NX602, guy gave it away for 150$ ) and will be using the pre-amp outputs from the head unit instead of the rear speakers as input ( and a remote turn on wire ) But for 180$ at walmart you cant go wrong. Also upgraded the front speakers to Kicker 6.5's... doing the rears this coming spring along with backup camera.