I have a Polk Audio 12" subwoofer available for $35. It works great, I just got a new system and have been storing it.

I'm easily located off I-15 at 7200 South, just north of Top Golf. Please call or text for exact address.

The Polk Audio PSW505 is a vintage subwoofer that carries a classic aesthetic appeal alongside its impressive list of features. Looks aside, you will find a polymer composite cone with a lower -3 dB limit of 28 Hz, making all levels of sound available to the user. This device can offer an output of up to 460 watts with a 300-watt continuous average, and the slot venting on this vintage subwoofer improves the bass response at all volume levels. All ports are pro-grade five-way binding posts, and an adjustable low-pass crossover with phase switch allows placement with almost any speaker combination. The nifty auto on/off feature automatically shuts off the amplifier and saves power if no signal is present for 15 minutes while the subwoofer remains ready to leap into action at a moment‘s notice when you're ready to listen.