Trikke 3-wheeled Scooter, Model T78cs. This patented "carving vehicle" is great for fitness or just getting around.  We are offering 20 lightly-used T78cs vehicles for $75 each (retail $250).

From the Trikke website:

The T78cs is a perfect full size starter, for bigger kids to adults. Equipped with a front 8.5" air tire and 7" polyurethane rear tires for a great starting set up for you to get the first feel of the fluid Trikke carving motion. The durable steel frame with adjustable handlebar height allows riders 12 years and up to ride with confidence on this model. Learning comes quicker on the T78cs by giving the soft air front tire, for more cushion and grip along with the use of polyurethane rear wheels. The hard wheels with direct ground contact allows new riders to find the 'Sweet Spot' of turning mechanics faster. You or your kid will discover new fun and fitness. (All major muscle groups engage while riding a Trikke carving vehicle). The T78cs is also an exceptional value being convertible; allowing you to upgrade all the wheels to larger polyurethane or air tires as your skills progress or wish to make a new ride. Adjustable handlebar height and pitch gives you the ability to continually grow with this ultimate carving vehicle. You can also fold down the frame with the trigger lever to easily store or transport.