Here you may download an order form to purchase a Mars product.  We accept Mastercard, Visa, Discover, and American Express.  Or you may pay by check (in US dollars only, please).  Fax the form to +1 914 239 3557, or scan and email it to sales@marsperceptrix.com Important notice to international customers: At present you cannot use the online ordering system from outside the US. You must first request a shipping quote, and then order with an order form