Walmart offers the Merax Finiss 21-Speed 26" Magnesium Alloy Wheel Mountain Bike in Green or Black, model no. MS008700JAA, for $299.99 with free shipping. That's tied with our mention from a week ago and the lowest total price we could find by $30. It features Shimano front and rear derailleurs, mechanical disc brakes, Shimano shifters, an aluminum frame, and magnesium alloy wheels.