Finding Schezuan peppercorn / Thai chili flakes in Atlanta metro?

I've been looking for a place to buy Schezuan peppercorns and Thai chili flakes (the kind available at every Thai restaurant) in the metro Atlanta area. The pepper flakes I'm looking for are spicier than what's sold as pizza topping, have a more complex flavor, a darker color, and (to me) a more pleasant burn.

So far, I've tried looking at Assi, H-Mart, Buford Highway Farmer's Market, and Cobb International Farmer's market, and had no luck at any of these locations and the staff had no idea what I was talking about.

I feel like I'm overlooking somewhere simple that would sell these ingredients. Does anyone know where I can get these two things? The closer to Marietta or Kennesaw, the better, but I know that's probably a pipe dream...