This is just my two cents but I think Iguana's should never be sold to anyone without the experience of keeping them or without a permit or something like that.

I think Iguanas are the most expensive, most difficult, and most time consuming reptile on the face of this earth!
I've had two of them and it was a living h***!
They require so many different foods, and heating styles. So much room and different suppliments!

I don't have any tips for you because as you can see all the experience I've had is BAD! If I were to give you a tip it would be to find an experienced keeper for him who has the room, time and money for an Iguana. (FYI - I'm not saying you dont)

Go get yourself another Ball Python! You can thank me later!