Picking up a leopard gecko

[JeffreH]

Stress will depend partly the individual gecko, age/size, and the number of hides you provide it; usually you want at least 3 hides in the viv, and one of these must be a humid hide (generally kept on the warm end of the enclosure). With adequate cover, the gecko will feel more secure in the larger enclosure. I don't think a 20L is too significant a jump up from a typical 10 gallon that might be recommended and it will be a lovely and spacious home for the gecko as is grows into sub-adulthood and for the majority of its life.

How old are the juveniles that you would be considering? Leopard geckos are a very hardy species and fare well in captivity. As long as they are 8 weeks of age or older I don't think think you'll run into any problems as long as you are following proper husbandry. Assuming they are healthy, once they have reached this age they are usually ready to be shipped and sold by the breeders safely.