As a reader discovered, Walmart offers the Braven Lux Portable Bluetooth Wireless Speaker in Black/White or Black/Gold for $19.99 plus $5.99 for shipping. That's the best we could find by $12. Feature include built-in 1,400mAh power bank, microphone, and up to 12 hours playback.
Also available is the Braven 705 Portable Wireless Speaker in Blue or Magenta for $19.99 plus $5.99 for shipping. That's $43 off and the best we could find. Feature include built-in power bank, microphone, water resistance, and up to 12 hours playback.
None of these moves requires a big investment, and they all can save you money.