Get a free sample of U by Kotex from Walmart. Look for the green “Sign Up Now” text near the top left of the page to get to the form to fill out. You should receive your sample within 4 weeks and I’m guessing it will include a coupon too. And if you haven’t chosen your free Kotex samples, go select the two you want to receive.
Update 9/9/10: Got my sample in the mail today, and it included a $1 off 1 coupon (expires 3/31/11).