LightInTheBox offers the Xiaomi Soundwaves Transformers Robot and Mipad 2 for $39.99. Coupon code "XIAOMI5309402" drops it to $34.99. With free shipping (choose "postal expedited delivery" at checkout), that's $42 off list and the lowest total price we could find. The toy transforms from a Mipad 2 to a robot.
Note: Uncheck "Add Shipping Insurance to your order" during checkout to remove the 49-cent fee.