I'm not sure how to estimate the cost of a setup as we don't know your room or where you live (and the temps and humidity you have), or what stores or suppliers you have nearby.
Maybe a list of equipment you'll need will help instead:
Screen or partially screened cage (either DIY or purchased) minimum of 2'x2'x4' for an adult cham.
UVB lighting: linear tube fluorescent ReptiSun 5.0 is a good standard.
Basking spot lighting: a regular house lightbulb can work fine.
Thermometer: a non-contact temp gun is perfect (check out Tempgun.com)
Humidity gauge: NOT the small analog stick on types from pet shops, but a good digital type.
Several live potted plants: Ficus, Schefflera (umbrella plant), or Pothos are commonly available and work OK. More plants in the cage are generally better.
Some type of water dripper, hand sprayer, or misting system or all three.
Feeder insects and bins to keep them in, gutload to maintain them.
Calcium dust, Calcium dust with D3, and a herp vitamin dust