Commercial Accounts

  • All first-time orders must be prepaid or we must receive a purchase order form displaying your official letterhead with signed authorization. Future orders will be billed Net 30 days.
  • For all textbook orders, please indicate the name of the instructor in the comment field.
  • Terms are Net 30 days.
  • All foreign (outside of U.S.) orders, except Canada, must be pre-paid.
  • All payments must be made in U.S. dollars. If paying by check or money order, "US Funds" must be pre-printed on the payment, not hand-written.
  • We accept VISA, MasterCard, and Discover credit cards.
  • Accounts must be current before new orders will be shipped.
  • Due to our Canadian shipment volume, we are required to collect GST on applicable Canadian orders.
  • California resale certificates are required for all California resellers.
  • Purchase orders may be faxed to 858-625-2336 or emailed to
  • Special web pricing for products sold on our web site is not available to distributors.

Individual Customers

  • Orders must be prepaid in U.S. dollars or you can use your VISA, Mastercard, and Discover credit card. All orders over $10.00 to contiguous U.S. are shipped via UPS (please, no post office box addresses). All other orders are shipped via United States Postal Service.