Deainthebox via eBay offers this LED Incoming Call Flashing Light-Up Case for Apple iPhone 6 Plus in Pink or Gold for 99 cents with free shipping. That's tied with our mention from last week and, outside of other eBay sellers, the lowest total price we could find for a such a case by $7. It's designed to light up using the phone's LED.
Of note, the case is also available in Green or Blue for a few cents more with free shipping. Expect three to eight weeks for shipping.