I "small hobby" breed leopard geckos (-1.3 group- 1 TSF- 3 cooking-). The younger ones are jumpier. They must be interacted with daily to not be jumpy or biters as adults. They are hardy as long as you meet their requirements: clean cage, dry hide, moist hide, proper heat and cool side of tank.
I would advice against getting any animal from a petstore like petco/petsmart. Often times you can find one through craigslist that needs a home. If you must buy look up some local breeders. Often times they have cheaper geckos much healthier than the petstores selection.