THELMA Members: You must be Signed in to receive your discounted rate! Simply click Sign In at the top of the page. The discount will be reflected immediately. YPF Members: Add the quantity you'd like to purchase and update cart. In the cart, enter your unique YPF code in the Discount code box and click apply.  If your discount does not show, please do not proceed with your order and call THELMA staff at 920.921.5410. ALL SALES ARE FINAL.