i picked up a phantom male from ralph around feb/march and i paid $1500. $600 seems low but it does seem like what a lot of them are going for now. ($600-900) Just make sure you're actually getting what you pay for. phantom is a very vague mutation and to the untrained eye, someone could trick you pretty easily. so just make sure you're buying from someone reputable!

but phantom and phantom combos rock, so if you get the chance i would pick one up!

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http://www.worldofballpythons.com/morphs/mystic-phantom/

it was done this year