What sort of cham is it you're getting? One thing we made for our Panther cham was a ladder.
Basically take 2 tubes from wrapping paper or clingfilm/tinfoil depending how high you want it.
Get some kebab/cocktail sticks
Poke sticks in between the 2 tubes with enough of them bottom to top to...
I definitely recommend sticks which you can find anywhere. But give them a good wash first in case of pesticides etc. Forked branches are great but just have to cut whatever you have down to size and make sure they're not too thick. Cheap artificial vines you can find on amazon cost about 2 quid...