Groupon offers the refurbished Ion Party Power 10-watt Wireless Bluetooth Speaker with Lights for $39.99 with free shipping. (Dave Parkers via Amazon charges the same price.) That's $10 under the lowest price we could find for a new one. It projects lights onto walls and ceilings and features Bluetooth music streaming, a 3" driver, and 80Hz to 23kHz frequency response.

Note: A 90-day Ion Audio warranty applies.