The best way to get Purity Products coupons is to sign up to their e-mail newsletter. You can find the link on their site: http://www.purityproducts.com. They send out weekly deals and specials.
Again, I must disclose that I work for Purity Products. “Not only am I an employee, I’m also a customer.” I take their Perfect Multi, Dr. Cannell’s Advanced D, and Ultra-Pure Omega-3 Fish Oil. :-)