If you’re referring to the Music Town in Klein, TX, they look legit. These sorts of stores are called “record stores” (they got that name in the pre-internet days when that was the only place you could get records, as in vinyl albums) and used to be more common. Prices will probably be higher than Walmart but they’ll have what you want or can order it for you, I’d recommend talking to the employees in there as they are often quite knowledgeable. Tell them you’re new to buying music and they’ll help you out