You said that your mom doesn't want a dog. Since you are not an adult, a dog shouldn't even be in the picture for you right now. As for your question about how much a chion is worth, well, you can't really put a price on a dogs life. I don't even think you should be thing about a dog rignt now. Stick with the guinea pigs. They make wonderful pets and do not require as much care as a dog, not saying that they are carefree, just not as much, both timewise and financially.