The ranco is a digital on/off thermostat and very widely used. It'll run $75 but its one of the cheapest digital units and works well.
You also have to figure out what exactly you have. If you have a common BCI then there is no way even a 40 gallon will be big enough but if you have some other smaller subspecies you might get away with it. You probably just have a normal common BCI. If you have a female, she could potentially hit 9ft. Why buy a 40 gallon tank that the snake WILL outgrow in a year or two?
Glass tanks are about the worst enclosure for a larger snake anyway. A tub setup or a nice snake cage is the way to go. Unfortunately these things cost money but a nice boaphile or animal plastics cage is a one time purchase that'll last the life of the animal. You'll save alot of money in the long run.
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