Having worked in the warehouse of one such supermarket the incidents of reptiles and amphibians turning up are a lot more common then the public realises. Sadly though most of the time the poor critters die as the result of being shipped half way across the world. On the other hand a palm tree centre down in Ham, Richmond I used to temp for received all kinds of interesting surprises in it's deliveries. Everything from scorpions to chameleons. Apparently they had a few geckos living happy and free within the greenhouses but I never did catch sight of anything.
Rhacodactylus ciliatus 1.0.2
Rhacodactylus auriculatus 0.0.1