There are only two, as far as I know, Panther chameleon breeders in the US that charge in the 300 range as of today. Most of the smaller breeders have either down sized on their breeding stock or have lowered prices due to getting stuck with animals they cannot afford to care for any longer... Economy effects everyone. I remember when a member with no reputation could charge $300.00 for an ambilobe male, or even $400.00 for a young male Nosy Mitsio. Now people are coming out with deals, discounts, and price ranges that are half the price above.
Another GREAT reason why some of these animals are priced in the $250-$350 dollar range is simply because of where they're coming from. These breeders provide an insane amount of time on the phone/emails, answering the most annoying questions that are constantly asked ALL THE TIME. Customer service is the best, and let's be honest, panther chameleons are extremely easy to care for and keep very healthy.
I remember I called Vinny (screameleons), and emailed him the with multiple questions, I definitely repeated question after question. He continued to answer them. Vince really is a cool dude by the way. But to take that much time out of your day, to help one single person... You deserve the reputation you have built, and you're entitled to charge the amount you're asking for.
These breeders, chameleons only (no experience with them) and screameleons (bought from them a bunch of times) don't just breed animals and sell them, they provide an outstanding customer service.
Oh yeah and also, most large scale chameleon breeders don't have time to breed their own feeders, and cricket bills add up.
Hope this helps.
You can never go wrong with screameleons.