Michelle since you were asking about Carpet pythons it's OK to use this forum or you could start another thread in the pythons forum.. Most of us consider them to be at least Semi Arboreal. I Keep IJs(WPs) Coastals,Diamonds a few Jungles and Coastal/Diamond crosses ETC ETC
As for Carpets your not likely to find any Inlands available in the US right now there are very very few in the country.. You can find babies of the big three for 100 bucks or so and the prices range up from there into the thousands for some of the Morphs IE Jags, Granites, Tigers ETC.
Carpets are not a bad python to start with and yes IJs AKA WPs tend to be the smallest of the Carpets you'll find available. Though most Coastals and Jungles you come across are not all that big and most males don't get much over 6 feet and many never get that size especially males. You can find Info and care sheets on any that you are interested in just by doing a search on line. Here's a site you'll find useful
http://74.220.207.106/~moreliap/forums/index.php
I think you'll find more info on Carpets and Morelia in general than on any other site.. Hey if you have any other questions ask away. Randy