A baby up to about 30" would be fine for two months in a tank half the size of the one you have now.
Look for Gary and John at the show, they have good snakes and are good guys. I can't think of what they call their business but you can find them here www.thereptileroom.org.
Gary owns the site and John is his brother. Shoot either of them a pm or email and they'll even let you know what they have before the show.
Hey Pattimus, how do baby boas in the wild avoid stressing out with all that forest around them?
LOL