Yeah no matter if there is quarantine or not I doubt they are being shipped from Africa or Madagascar in any kind of priority shipment when they can be sold at 50 dollars each.
I just checked, Fed Ex international priority which is about the fastest you would get and will be 24 to 72 hours transit (From experience) for 5lb 12 inch cube from Zanzibar Tanzania to New York New York is about 490 bucks. Granted you would likely ship a larger box with more chameleons but this gives an idea at least. Live animals would likely increase customs time between 1 (best case) and 5 days in a box with no food or water would be normal in this best case.
Now we all know these 15 dollar senegals or the 75 dollar cresteds are not being shipped priority and shipment alone is taking a minimum of 10 days if everything goes well.
I guess what I am trying to say is we don't need quarantine to assume these poor chameleons are spending a lot of time in a box getting jostled about with no food or water in poor temperature conditions.
If I was to import a chameleon I would pay the big bucks, pre-notify customs, make sure all the paper was in order, and meet them at the customs facility they flew into. ut this would get very expensive very fast and we can rest assured importers do not do this now.