My local Marshall’s gets random tech adidas items that I haven’t seen sold anywhere else. I’ve had good luck there. Kohls always has a good selection of tech stuff and a good amount of the time it’s on clearance.
I frequent College Collectibles in Peachtree City. They have a similar selection to what you will find on fanatics.com. They also had a location in Locust Grove in the Tanger Outlets last time I was down that way, but it's been a few years.