You could go to Home Depot or lowes and grab a big Pothos plant. Just wash off the leaves well and re-pot with some topsoil, and put some stones over the dirt so they wont eat it. Pothos fills up a lot of space and your little guy will enjoy the cover. You could also do the same thing but for any plants on the safe list. but honestly, as said before your little guy is skinny and sick, you're better off returning him unless you've got a pile of money laying around to pay the vet bills. There is tons of great breeders sponsoring on this website, all of them are great and sell healthy animals. But if you still have your heart set on a chameleon then you need to surf this website and ask for help to set up the cage properly before bringing in a new animal, to make sure you have everything perfect.