Walmart has the VIZIO 36" 2.1 Channel Soundbar System - SB3621n-E8 for $98 with free shipping. List price: $148. It's Bluetooth compatible so you can stream music from your mobile device in high quality, too.
Amazon has the Tronsmart Dual-Driver Portable Bluetooth Speaker for $43.32 - $17.33 off with coupon 6CJPYFEB = $26 with free shipping. It features a 12 watt subwoofer drivers, 25W dual-driver 15-hour playtime wireless speaker with deep bass, hands-free calling.
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.
Amazon has the NHT SuperZero 2.1 Mini-Monitor Speaker (Single, Gloss Black) for $57 with free shipping. Retail price: $120. Has excellent Amazon Reviews.