Mega Internet Sale via Newegg offers the Angry Birds Air Swimmers Extreme Turbo Remote Controlled Flying Red Bird Balloon for $7.99 with free shipping. That's the lowest total price we could find by $12, outside of the price below. It requires 4AA batteries and must be filled with helium (not included) for flight.

A close price: Amazon offers it to Prime members for $9.49 with free shipping.