Boas take 3-4 years to grow up to adult size so a tub can be used for quite a while. If the ambient in your home is fairly cool you can run two UTH's under the tub, one to create a hot spot of 88-90*F, the other around 80*F on the cool side. Put a hide over each and the water bowl in between them.
Males typically stay smaller than females, but they can still get to respectable size. I have three in the six foot range. If you want something smaller look at the Central American or Mexican localities.
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