Have anyone ever keept gila monster/Heloderma suspectum? How is it

My friend have seen something looking like gila monster on biggest Terrarium Fair (or what is it called in whole europe(hamm in Germany)). I have no idea if it was really that or if it was some skink? But if I can possibly buy this how much could something like this cost and how does it behave or how do I keep it alive I literally can't find shit about it so I have no idea if it was really gilla or some skink