You said..."it lived in a dark pen since the guy got it"...that's terrible! I'm glad you are rescuing it from that.
You said..."for the time being I'm keeping it in a shoebox with sand a cup filled with water and a lamp"...assuming that the lamp doesn't provide UVB, is it warm enough to take it outside for a while each day where you live? Do you not have a larger box or a tupperware type container or an old aquarium you could use for a few days? Any of these would be better than a shoebox. You might "bake" it if you are making the shoe box too warm. Most chameleons won't drink from a dish...you need to mist it or use a dripper. As long as the chameleon is not only a couple of months old, you can use a plastic container with a tiny hole in the bottom of it as a dripper. With very young chameleons, you have to be careful because the water could be aspirated (end up in its lungs) if you use a dripper.
You said..."Oh, it has pooped once, but it was like gell"...healthy poop should be brown and look like a little sausage. Gel can also be part of defecation, and there should be a white part that is the urates too.
To get it to eat, drip water on its nose and when/if it starts to drink, put the head of the cricket between its teeth and it should chew it and swallow it. If it won't drink and it won't eat the cricket, then its quite sick IMHO. How big are the crickets? They should be a size that fits comfortably into the chameleon's mouth.
You said..."I don't have the know how or the budget to keep a chameleon. I hate to say this, but I think I need to give it to somebody who knows what they are doing. If anybody wants the little guy and is living in the Los Angeles area just say so on this thread and I will let them have it. I just don't want the thing to die, I don't have the budget, and my dad hates anything that isn't human. So if you want one, heres you chance. Thanks again for the help guys"...it sounds like letting it go to someone who has the budget is a good idea...but, in the meantime I hope you will do what you can for it.
If you need any more help (if you can't get it to eat, drink, etc.) while its still with you, just ask....and I'll do the best I can.