I will not be going, but good luck trying to find some good prices (I don't live in Il.)
If you're just looking for a pet, you can actually get to look at the chameleon in person which is a good thing. Look for any signs of sickness like dark dark skin, bent arms and legs, swollen joints, bubbles by the mouth, awkward stuck shedding skin, or wounds like missing tail pieces.
If you're looking to breed, I see this is your first post here, I suggest you do more research because breeding costs quite a bit of money and isn't much of a money-maker. People who breed simply care enough to continue our hobby to breed them. Usually baby chams take tons of effort to raise because of the huge amounts of small bugs they eat.