I don't know for sure, but one good bet may be the Chicago market at Pine Tree Plaza (near Chef Liu's). They have an eatery in back and I recall seeing tamales the last time I was there. Also, I haven't looked lately, but there used to be a tortilla factory on Armour Dr not far from the Sweetwater Brewery. So, leads if not the answer.
5221 Buford Highway Northwest Doraville, Atlanta, GA 30340