Ends today. Newegg has the Kinivo ZX100 3.5mm Mini Speaker with Rechargeable Battery for $20 - $5 off with coupon code EMCXVXN233
[Exp 2/13] = $15
with free shipping. Currently offered around $20 and up online. Features Expansive Resonator Construction Design to give the best low frequency output, and 360 degree sound with rich bass resonance.