Here are three animals caught in Krabi, Thailand, in November 2007. These were all caught around the same area, a large open field that used to be a Banana plantation, right on the outskirts of Phanom Bencha national park.
A juvenile, only around 6 inches in length

A sub-adult

An adult that had recently taken a large meal (as can be seen from the photo!)

My friend searching the plantation

All animals were caught in the early evening, just as it was getting dark.
How readily available are these animals in Europe? I dont know of any private keeprs in the UK.