I work at petsmart, and they have had chams for a long time.

I can't speak for other stores, but mine has done a fine job. The chams are kept in the back where customers can't stress them out by staring all day (they have a sign out front advertizing them for those interested)

The chams are in a large reptarium (screen mesh enclosure, perfect cham homes) with many plants for climbing and hiding amongst.. there is a water dish with an air stone that splashes the water on the leaves, since chams don't drink water from a bowl, they only lick it off of the leaves of plants.

They are lively, and have good weight on them. My store has done fine with them.. though I'm sure others don't do so well.

Oh forgot to add that they each have their own enclosure.. keeping chams together is a no-no.