LightInTheBox offers the Ruito 16" Unisex Folding Bike and Stroller in Red, Blue, or Yellow for $474.99. Coupon code "SO2331552" drops it to $299.99. With free shipping, that's $1,100 off list and the lowest total price we could find. It converts from a bike to a stroller and features double disc brakes. Deal ends December 29.
Note: Uncheck "Add Shipping Insurance to your order" during checkout to remove the $8.99 fee.