For $100, you can get Samsung’s 4.1-Ch. Wireless Sound Bar (Refurb, Reg. $180)

$100

Update 8/9 @ 8:22 PM: JBL offers its Boost TV Soundbar with Bluetooth for $99.95 shipped (Reg. $150+). Rated 4.4/5 stars.
Today only, Woot offers the Samsung 200W 4.1-Channel Soundbar with Bluetooth (HW-KM37) for $99.99 Prime shipped in certified refurbished condition. A $5 shipping fee will be added to orders of non-Prime members. Regularly around $180 in refurbished condition from third-party sellers on Amazon, this is one of the best prices we’ve tracked. With its wireless subwoofer and rear speakers, this setup is great for anyone upgrading from built-in TV speakers who want the full surround sound effect without running tedious cables all around your home theater. Ratings are thin here, but Samsung is well-reviewed overall. A 90-day warranty is included with purchase.

Samsung 4.1-Ch. Soundbar features:

Surround yourself in sound with the expansive sound with the Samsung HW-K370 Soundbar w/ Wireless Subwoofer. It’s Bluetooth-compatible for one-touch control and a seamless home entertainment experience, and the wireless subwoofer gives you powerful, life-like bass. Add the Wireless Surround Kit for clutter-free home entertainment, and control your system from your Android phone with the Samsung Remote App.