Walmart offers the RoyalBaby Kids' 14" BMX Freestyle Bike in White for $100.23. Order via pickup to cut the price to $61.87. (Amazon offers it for about a buck more.) That's the lowest price we could find by $13. It features an enclosed chainguard, non-slip pedals with reflectors, a BPA-free water bottle and cage, bell, and training wheels.

Update: The price at Walmart has fallen to $60.63 with pickup.