Mindkoo Electronics via Amazon offers its Mindkoo Indoor Smart Wireless Classic Bluetooth Speaker with LED Light in Green for $39.99. Coupon code "85WK3YKK" cuts it to $31.99. Plus, Prime members grab free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.95.) That's $68 off and the lowest total price we could find. It features adjustable LED lighting, six hours of playtime per charge, an audio cable input, and 90Hz to 20kHz frequency response.