I have the same size cage and use two fluorescent lights for my plants in addition to UVB and heat. One is 18 inches and one is about 10 inches. Both are daylight bulbs with a color temperature of 6500K. If the daylight bulbs don't work for you, there may be other problems with the plant...
I recently bought 500 1/4" crickets and a cup of small hornworms from site sponsor Great Lakes Hornworm. They provided me excellent feeders at a great price. The crickets are much healthier and cheaper than those I usually buy at the chain pet store. Communication was seamless and everything...
There appear to be many issues with your husbandry. Your chameleon needs a UVB light and more frequent misting. Most discourage the ice cube method. You should certainly know what the temperature and humidity level of your enclosure are. Calcium with D3 and a multivitamin are usually used...
I usually get everything I need from joshsfrogs, amazon or diycages. Amazon and joshsfrogs will both give you free shipping when you spend a certain amount.