If it's those rare multi colored ones that i'm thinking of, they are selling in atlantic luna vendors for 10-15 mil, then again, it's atlantic luna venors. I would put my finger that they are worth 7-12 mil as of today, some acually look cooler than others, and the cooler they look the more they will be worth. Plus many people are still reciving their gifts so i would wait til the end of gift reciving to put a real price tag on it.
If you want to make a profit, i'd wait til October/november before next xmas, because they will increase in value as time goes by, but they might come back next christmas thus bringing down their value again, however if these never return in any holiday they will continue to increase in value for many years to come. so it's a risk thing