Give the gift of cleaner air, better breathing and allergy relief. Available in $25, $50, $100, $200 and $500 denominations. Convenient and easy to give and use. Never expire! Gift certificates can be redeemed with any purchase by calling our sales team at 1-800-339-7123 M-F 8:30-5:00 EST. Simply complete our form and we will contact you, via email or phone to procure your payment and then email or mail you your gift certificate.