Walmart offers the refurbished Vizio 28" 2-Channel Bluetooth Sound Bar for $39 with free shipping. That's $39 under the lowest price we could find for a new unit. It features a 70Hz to 19kHz frequency response, 3.5mm stereo mini jack, and USB. A 2-year warranty applies, although it's not clear who backs it.
There are plenty of great ways to spend your money, but you can safely leave these products on the store shelf.