In kits where live materials, such as Elodea or algae, are needed, a pre-paid redeemable voucher will be included in your science kit. Simply follow the directions on the coupon to redeem and ship the item to your desired location. Please note that these coupons must be redeemed ~2 weeks in advance of teaching the corresponding lesson. Vouchers will be listed as a supply on the Packing Lists that will arrive with your kits.