Ask the breeder/seller specific questions about the feeding history about the animal. Make sure you get an established feeder. I wouldn't buy anything that hasn't been feeding consistently for at least 4 or 5 weeks. I'm sure others will chime in on that as well. I would also take a look at Morph Market to get an idea of morphs are selling for so you have an idea of prices in advance. If a deal seems too good to be true, be wary.