Altex is well-stocked and knowledgeable. They aren’t exactly a discount chain though. And you pretty much need to know what you want to get many answers from the sales staff.
If I want something at a good price, I go to Fry’s. If I want something specific that I *know* will work right, I go to Altex.
Unfortunately there is no Fry's in Corpus Christi. Either I have to go to Fry's in Austin or Houston, or I buy from PC Connection or Newegg.com. PC Connection allows ordering till 2 am CST and still getting next business day afternoon delivery. So I could Order it just before 2 am and get it just 13 hours later delivered to my door.