Chameleon Checklist:
BASICS:
-screen cage depending on the size and age of your chameleon. if you are on a budget, than I would go straight ahead and get it's permanent enclosure. 48'' tall or bigger is recommended of full sized true chameleon. With this being purchased, if needed, you could section off a certain amount of the cage until it is big enough for it's full size. Also if you are on a budget, making your own cage could very well be the way to go (depending on what you want to use). There are plenty of threads on DIY cages (not the company DIY cages) but do it yourselves. Just clarifying.
- for any cage single cage a 24'' fluorescent light fixture would be needed. This needs to be a T8 size, and if you can find a double light fixture, that would be most beneficial to you. Fixtures aren't expensive, you are looking roughly around 20-25$ at Lowe's, Home Depot and Walmart.
- along with the light fixture, you will need a ZooMed ReptiSUN 5.0 or an Exo-Terra ReptiGLO 5.0 as your uvb source. If you end up finding and purchasing a double fixture, you can add a 6500K daylight bulb. This will aid to plant growth, give extra viewing light and not output any unnecessary UV. These bulbs are roughly 3-5$ at Lowe's and Home Depot.
- lastly for light sources, you will need a 5.5'' or 8.5'' light dome (look on Kijiji.com for used ones in your area) your best bargin would be using an incandescent house bulb as your heat sources basking light. You would need to use common sense and play around with different wattages to achieve what you want your basking spot to be. Please do research to know exactly what basking temps the species and age of your chameleon needs. These bulbs can cost around 1-2$ for one bulb and can find at any hardware store or Walmart.
- digital thermometer and hygrometer to monitor your basking temp and the humidity in the cage. You can find indoor/outdoor ones that are electronic, and will read both for between 9-15$. **YOU WILL WANT ONES WITH WIRED PROBES INSTALLED WITH THEM.
ESTHETICS:
- vines and branches: you can purchase a pack of BioVine or Exo-Terra vines to get you started, these can be used perfectly for horizontal walkways. On budget, you can also go out and find good condition branches. Please do research on how to properly clean and prepare before entering into the tank
- foliage: live potted plants are recommended highly. you can find Schefflera Aboricola, Ficus Benjimina and Golden Pothos at most Home Depots and Lowe's. They are generally not expensive. But you will need to purchase an organic soil to replant, and riverbed rocks to prevent dirt ingestion.
- fake plants: it never hurts to fill up spaces with fake plants. you can purchase trusted fake plants by Exo-Terra (silk proffered). On budget, you can pick well crafted fake plants from Michael's Art Supplies. (make sure the plant is not made with toxic dyes and inspect to see any possible metal wire hazzards)
ODDS & ENDS:
-water bottle or pump sprayer. You can also buy a starter MistKing with a timer in case you aren't home consistently to always give proper mist downs.
-a timer for your lights: rid of the hassle of turning on and off your light sources. 12/12 hr light cycles is commonly used.
-laying bin with play sand (if acquiring a female chameleon) you dont need this right away though.
I think that's all.

I hope this helps.
-Phil