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Please note: THE ON-LINE SHOP WILL BE CLOSED ON JULY 4TH AND 5TH! ORDERS WILL BE SHIPPED ON MONDAY JULY 8TH! Orders made using a purchase order or check will be shipped once the payment has been received. PLEASE MAIL ALL PURCHASE ORDERS TO: 4511 KNOX ROAD, SUITE #205 COLLEGE PARK, MD 20740 AS WE NO LONGER ACCEPT FAXED PURCHASE ORDERS. IF YOU ARE A SCHOOL LOCATED IN THE STATE OF MARYLAND AND ARE TAX EXEMPT, YOU WILL NEED TO CALL THE MAIN OFFICE TO PLACE YOUR ORDER. PLEASE CALL 301-314-9739 AND EMAIL A COPY OF YOUR TAX EXEMPT CERTIFICATE TO INFO@NHD.ORG.