MiniInTheBox offers the Funduino Advanced Starter Kit for Arduino for $29.99 with free shipping. (Select "Postal Service - Tracking" under "Shipping Method" during checkout.) That's $15 off and the lowest total price we could find. It includes an Arduino-compatible Uno board and a range of electronic components and modules such as an LED emitter kit, stepping motor, temperature sensor, steering engine, and joystick. Deal ends December 29.
Note: Uncheck "Add Shipping Insurance to your order" during checkout to remove the 99-cent fee.