Depending on where you live i'd say. The site sponsors sure beat retail prices, but shipping is what hurts at times.
Is (MS) Minnesota? I would definitely go with Pangea reptile, as they are located in Michigan. Matt and his team are great people to deal with to, and his prices for Zoo-Med Repti-breeze screen cages are unbeatable.
you may also put him in his adult cage any given time you'd like really. It is your preference too, as well as the chameleon on when he/she goes in it. I would only suggest cup feeding, as it may be hard for the small chameleon to hunt it's food.