Electronic Express via eBay offers the Kenwood 12" Enclosed Subwoofer with Amplifier for an in-cart price of $169.54. Coupon code "PHOLIDAY20" knocks it to $135.63. With free shipping, that's the lowest price we could find by $61. The subwoofer features 300 watts RMS and a frequency response of 40 to 300Hz. The amplifier features 70 watts RMS into two channels at 4 ohms. Deal ends December 9.

This coupon can be used up to two times per eBay account.