To contact us, call (toll free) 1-877-260-6039.  If you reach voicemail it will be for our main business (educational & scientific supplies).  If no one is available at the time you call, please leave a voicemail and we'll call you back.  You can also reach us via email at our main address. If you order an item and for some reason it appears your order did not go through, please call us and indicate the item you tried to order.  (Please leave your name and phone number as well!)  Thus far the Paypal shopping cart seems to be working as intended, however.