Walmart offers the Razor Serpent 20" Boys' BMX Bike in Red (pictured), model no. 42006, and the Razor Rhapsody 20" Girls' BMX Bike in Pink, model no. 42007, for $69 with free shipping. That's the lowest total price we could find for either by $50. These single-speed bikes feature front pegs, high tensile steel frame and fork, and single-caliper brakes.