Ask him to make it right through partial refund. May I ask how you paid? If via cc or paypal, you can always contest the charges, as you did not receive the item you paid for. They are on your side. This always gets a merchants attention, as the cc company can charge the amount back to him. You will have to prove your case, and I'm not sure visa can tell one snake from another, but if you have an email from the breeder saying he sent you the wrong snake, that would be golden.

Just a thought, and a suggestion I didn't see yet.

Good luck, keep us posted.