As one of its daily deals, Hobo Ninja offers the Red Solo Cup Party String Lights for $14.99. Coupon code "DNREDLIGHT" cuts it to $11.99. With $1.99 for shipping, that's the lowest total price we could find by $8, outside of the price below. It features a 12-foot string of battery-operated lights. It requires three AA batteries, although it's unclear whether they're included.