From what I gather there is only one of these in existence, and it sit on display at Hammacher Schlemmer (New York). In case anyone was wondering how much something like this goes for, well the answer is $75,000(US).
The Lean Mean Green Machine
This is the 9' three-wheeled motorcycle inspired by the Green Machine, the classic big-wheeled pedaled tricycle from the 1970s. Its proportion, color scheme, and striking 45" diameter front wheel--the world's largest--are so convincing, it compelled the toy's 1975 designer to see the motorcycle for a side-by-side comparison with the original toy. At its heart rumbles an air-cooled, 80" cu. Harley-Davidson v-twin Evo--hailed by some as the engine that saved the iconic company--providing 60 horsepower for speeds up to 50 mph. The front wheel is driven by a chain housed in a protective cowling that replicates the toy's frame and, like its predecessor, the cycle is steered by two handheld push/pull levers that control the two rear wheels via a directional linkage. The hand levers include brakes while a foot lever controls its manual 6-speed transmission. Its 8 1/2-gallon fuel tank is built into the frame, hidden from view, providing a range of 400 miles. 9' L x 4 1/2' W x 45" H. (450 lbs.) - Hammacher Schlemmer