You will see ETBs and GTPs from anywhere between $200 to $2000. It really depends on the quality of animal you are looking for. Before making a purchase like that I would suggest reading up a good bit on both...especially care for young snakes if you are looking into getting a ETB. Definately be cautious when looking at these two animals...there is garbage out there just like any other part of this hobby....I would check the vendor list to see if any good chondro/boa breeders are going to be there.