Get Up to 40% Off Bikes for adults and kids at Walmart.com. Shipping is free over $49. For example, get this picture 29" Mongoose Ledge 3.5 Men's Mountain Bike for $199, which is marked down from $249 and the lowest price we found by $44. Or, get this 18" X-Games Boy's Bike for $59.97, which is $10 less than elsewhere. Sales tax is charged in most states.