TMSHelmet via eBay offers 50 Paper Chinese Lanterns in White for $24.25 with free shipping. (Buy4Easy via Amazon charges a few cents more.) That's tied with our mention from last week and the lowest total price we could find by $12. Each lantern comes with a fuel cell, which can lift the lantern above 3,000 feet.
Allow 1 to 2 weeks for delivery. Note that you should check your state and local regulations concerning the use of these lanterns before purchase.