Big Super Tigres use low oil fuel so you can cut the $12 glow fuel (that has about 18% oil) with cheap straight methonal to get as low as 10% fuel. That'll drop the price further.
For a real bargain just look around for a used one. They're not hugely popular on the used market so normally go for a good price. You save the cost of the three gallons of fuel it (I've read) takes to break them in.