Lightning Audio L1-S412 12" 4-ohm subwoofer at Crutchfield
Lightning Audio P3.10.4 (p3104) 10" Single 4 ohms Subwoofer
Best Buy: Lightning Audio 12" Single-Voice-Coil 4-Ohm Subwoofer with Polypropylene Cone P2.12.4
Lightning Audio By Rockford Fosgate L0-S412 LA-Zero 12-Inch 4 OHM Single Voice Coil Subwoofer, Set of 1 - Walmart.com
2) Lightning Audio 10" subwoofer speakers with enclosed box in Manhattan, KS | Item 2430 sold | Purple Wave
LIGHTNING AUDIO LA-L2-D410 [More Than Price Realized A Heavy Bass Reproduction LA-TWO Series Former Having Excellent Cooling Of The Voice Coil] Ys Corpore | Sub Woofer Speakers | Croooober