Danny Reinecke has some beautiful pictures of Uromastyx thomasi that he is allowing me to share. Here is the link to all Danny's pictures. http://www.uroranch.com/Danny%20Reinecke/Danny%20Reinecke.htm
To me the Uromastyx thomasi is one of the most beautiful Uromastyx species there is, way more so then a shield tail agama. But I am an Uromastyx person and beauty is in the eye of the beholder. As far as the price they are
not available in the US that I know of and very few people have them in captivity at all. It is just like snakes, it is the rarity and beauty that dictates the price. I do agree with you on one thing however the landscaping does look very nice in there habitat.