Don't look for sites. Look for breeders. They know their animals and they know exactly what was, or was not done, from before the baby was even conceived.
I have babies from @Carol S and @kanalomele that I am very happy with. I would have bought from @biochemnerd808 too, but she didn't have any when I was looking. All three of these ladies start their babies very well. There are many other breeders that I would not hesitate to buy from here too. I mention these three because I have personal experience with them.
I second the buy from breeder advice. I have bought from an online site, and a breeder here, leopard hatchlings, both from online did not survive. The 3 from breeder are almost 2 years, and doing great.