Amazon has the Polk Audio HTS 10 10" 200W Home Theater (Black Walnut, HTS SUB 10 BLK WAL) for $225 with free shipping. List price: $350. It features a powerful 200W optimized class D amplifier. Has excellent Amazon Reviews.
eBay has the Rockville 5.1 Bluetooth Home Theater System (HTS56) for $150 with free shipping. List price: $289. It features a subwoofer with built-in receiver, a remote control, and five speakers.
eBay has the JBL Link 10 Smart Waterproof Wireless Bluetooth Speaker for $50 with free shipping. Features a microphone with Google Assistant.
Amazon has the Teac AI503 USB-DAC & Integrated Amplfier w/ Bluetooth (Silver) for $553 with free shipping. Retail price: $1000.