I have a ball python right now, and he is in good health. So I am thinking of picking up a new snake at the NC reptile expo, preferably a boa; but I would like/need one that would be about 4-6 feet I looked in the boa FAQs at the smaller boas, none interested me except for the hogg island boa really; and I don't know if I could find one at the expo. I would love a rainbow boa, but I am not experienced enough to keep one.

So what are some small, but not too small boas for a beginer?
Some prices would be helpful, as I am a 16 year old working at a grocery store.