Woot! has the https://www.woot.com/offers/lg-sk9y-5-1-2-ch-soundbar-w-subwoofer-16 (SK9Y) refurbished for $250 with free shipping. Features 501-watt RMS total system power, 200-watt wireless active subwoofer, dual-band WiFi & Bluetooth 4.0, built-in Chromecast & compatibility with Google Assistant, HDMI with 4K passthrough.
Has good Amazon Reviews.
Amazon has the ELAC Uni-fi UF5 Floorstanding Speaker (UF51-BK) for $352 with free shipping. List price: $580. It features a custom-designed concentric driver, frequency response-42Hz to 25,000Hz, 3-way design, 4ohm impedance.
Has excellent Amazon Reviews.
eBay has the Klipsch RSB-14 Sound Bar With Wireless Subwoofer Bluetooth Surround for $279 with free shipping. Features 4K Ultra-HD Video pass-through, Integrated Dolby Audio, 8" wireless subwoofer.
Amazon has the Amazon Echo Sub for $110 with free shipping. List price: $130. Features delivers down-firing, 100W deep bass sound through a 6" woofer. ust plug in, open the Alexa app, and wirelessly connect to your Echo device(s) to control music with your voice.
Has good Amazon Reviews.
eBay has the Vizio SmartCast Crave Go Wireless Speaker (SP30) for $33 with free shipping. Features 75Hz to 20KHz frequency reponse, Bluetooth.
Amazon has the Pioneer Andrew Jones-Designed Bookshelf Speaker Pair (SP-BS22-LR) for $114 with free shipping. List price: $179. Features 80W capacity, 4" woofers, 1" tweeters.
Has excellent Amazon Reviews.
Amazon has the Pioneer Andrew Jones-Designed Dolby-Atmos Add-on Speakers (SP-T22A-LR) for $89 with free shipping. Features 4" woofer and 1/2" tweeter.
Has good Amazon Reviews.