I've read this about dogs, but it may be the same for leos...
basically, it said never to buy animals (unless they're rescue animals) from a pet store... usually, the pet store doesn't get a great breeder. Maybe they're technically a breeder (you're a breeder when you have a litter/clutch and own the female), but probably not good ones. If you "rescue" an animal from a pet store, you may save one animal but the "breeder" will go "hey, I made some money off that one, I'll keep producing them so I can get more money!" So you'll possibly cause MORE animals pain, the ones that are coming after the one you bought.
Anyways, I don't have that much experience in leos, and I've never had a skinny tailed one. so good luck with advice from other people!