Hi Reyes, welcome! Desmognathus auriculatus, the southern dusky salamander, is rare even among hobbyists who keep native US salamanders. They have very patchy distribution and are legally protected in most parts of their range, and as their lifestyle is specialized for thick muck in floodplains, they wouldn't make particularly interesting captives. I'm guessing you saw this on one of the big reptile and amphibian retailer websites, since I'm not aware of anyone on this forum selling auriculatus. Please know that, while the prices on those sites can be attractive, their salamanders are often very unhealthy and (apart from axolotls) nearly always wild-caught, with highly unsustainable and sometimes even illegal collecting practices.
I'd strongly recommend buying your salamander from a reputable breeder; there are a decent number of species for sale in the Advertisements section of this forum, and people are generally happy to recommend breeders they know for harder-to-find species. You will pay considerably more than at the big retailer websites, but as I mentioned before, the salamanders from those big retailers are very often unhealthy—there's a very good chance that if you buy a $15 salamander with $25 shipping from one of those sites, it will arrive sickly and, even with the best care you can give, die within a couple weeks. Better to pay $50–$100 + shipping for an ethically-sourced salamander that will live than to throw away $40-$50 on an unethically-sourced salamander that dies in a few weeks.