We have had a lot of herping friends and customers who express concern about buying cages for their young chameleon. They figure if they purchase a cham at 3 months, he will need 2 more cages before he is an adult. We agree with them.
However - we figured out the
FIX:
Purchase the size cage you will need when the cham is an adult (plan for the big one). If you get the aluminum ones with the removable plastic floor, this is so easy it is ridiculous!!! But don't smack yourself on the forehead - you might get a headache.
Simply sit the cage over a sturdy box that fits inside the cage. Remember the push-up-popsicles...? We call this the push-up house! The box pushes up the floor. The door still opens; you can still put lights on top; you can still use a dripper. You can add plants and branches - but the space is just smaller for the young chameleon.
As the cham gets bigger/older, cut the box in half. Put some new branches in and new plants. When the cham is an adult - eliminate the box entirely. Add taller plants and more branches. Voila! Instant adult cage - when needed.
If you purchase a cage with a solid bottom (non-removable), then create a "floating" floor. Go to Home Depot and have them cut a piece of plexiglas that will fit
inside the cage (24" x 36" or whatever the inside dimensions). Use a box underneath the fake floor. As the cham grows to adulthood - just lower the floor until you don't need it anymore.
Hope this helps ya...

~Morgana