I have seen them on marine depotlive and fosters and smith. Those things are awesome!!!! I used to have one!!! they are the SMARTEST animal I have ever seen in a tank. but make sure to have plenty of snails and crabs cause they are pigs. and dont get hit by one they dont call them thumb splitters for nothing!!!
And make sure to watch the video from NinjaFish on www.reefcentral.com, he has a small nano with a mantis in it...CRAZY VIDEO! If you need a link let me know and I will go hunt it down! Those are amazing animals. -DIRT