They won't always ask for I.D.

improve your chances of not getting carded and buy only 1 item with DXM in it.

stores with automated check outs work too. sometimes they will still card you though. Experiment with different products. For instance, a bottle of Robotussin will alert the cashier to check your I.D. while a Zicam may not.

all of these products are avilable online, too. I'd like to see them card u there. Mwahah