All4Cellular offers this 12x Telephoto Lens with Mini-Tripod for Apple iPhone 4 / 4S in Black for $19.95 with free shipping. That's a buck under the lowest total price we could find for a similar item elsewhere. Designed for use with the iPhone 4's camera, this lens features a 12x optical zoom and comes with a mini-tripod, carrying case, and more. Deal ends March 8. Update: Sold out.

Update: As a reader found, emilyandilly via eBay offers an iPhone 5 version for $17.31 with free shipping.