With our prepaid coupons, you can order your organisms in advance and pay one price that already includes your future shipping price. We’ll send a coupon(s) that you later return to us by phone, fax, Web or mail to tell us when you want the organisms delivered. Contact us or return the coupon at least two weeks prior to requested delivery date to ensure prompt arrival of material. Don’t worry; these coupons never expire so you can redeem them anytime. They are useful when you need time to establish a habitat before populating it or need to purchase living materials with budget money but are unsure of the timing or exact quantity needed for your schedule.