Tiergrade via Amazon offers the Tiergrade 33-Foot Dimmable LED String Lights for $19.99. Coupon code "RY2J5YW2" drops it to $11.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.69.) That's $18 off list and the lowest total price we could find. It features 100 LEDs, remote control, and ten modes. Deal ends December 15.