Kicker PT250 10" Subwoofer with Built-In 100W Amplifier - Walmart.com
Dayton Audio - DTA-2.1BT2 100W 2.1 Class D Bluetooth Amplifier with Sub Frequency Adjustment
Fosi Audio M04 Subwoofer Amplifier for Home Theater Mono Channel Digital Class D Integrated Power Amp for Passive Speakers Subwoofer Rated 100W MAX - Newegg.com
Nobsound NS-03G Mini 100W Subwoofer /Full Frequency Mono Channel Power Amplifier | eBay