cy_monsters via eBay continues to offer this 100-LED Light String
in four colors for $4.99
with free shipping
. That's tied with our mention from last month and the lowest total price we could find by $2. They're waterproof and feature several different lighting modes, color settings, and patterns.
A close price: xihusz2012 via eBay
has them for the same price.
Note: Expect shipping to take up to three weeks.