Walmart has the Mongoose Men's 29" Billet Mountain Bike (R8080WM) for $149 with free shipping. List price: $200. Features 21-speed twist shifters, Shimano rear derailleur, mechanical disc brakes, 29" knobby mountain tires, tool-free adjustable seat.
Amazon has the GoFloats 6-Foot Giant Inflatable Beach Ball (GI-BEACHBALL-6-01) for $50 with free shipping. List price: $60. Has good Amazon Reviews.