Great people at Jesse's and it's tamale time. But if you want a dozen big ol' burrito tortillas for take home, my choice is Rene's right on I-35. If they are closed and they frequently are....Rosa's on Franklin will sell you surprisingly good breakfast taco sized flour tortillas.
If you want fillings inside your tortilla, IMHO, Pablos on 19th has the best flours in the Waco area. If you stand at the window, you will see them roll out, and then cook your very tortilla. Takes a little time, but its a great place, cash only.