We are accepting orders from Canada.  There are two ways to get the order to Canada:

Personal Delivery:  I attend the Spring Federation workshop in the Seattle area in March
each year. In the past, I have delivered boxes of tubers to Canadian dahlia enthusiasts at
that meeting. I obtain an Agricultural Inspection Certificate  and include it with the
order($20.00).  This saves the high shipping costs to Canadian customers.

Shipping:   Priority Mail: The cost of shipping is about $27.95 for a medium flat rate box.s.  
That box should hold 20-30 tubers.
My software already charges you $8.00 for shipping. You need to pay an additional $19.95 to
cover additional postage. Also you need to pay for the phytosanitary certificate, $20.00.
Total cost: $39.95  for Canadian orders shipped by Priority Mail.
Canadian Orders
Other Countries
Shipping:   Priority Mail(Flat Rate Box): The cost of a medium  flat rate box is  $45.50. My
software charges you $8.00 for shipping.  The extra cost of shipping overseas is
$37.50($45.50 less the $8.00).  

The cost for a Phytosanitary certificate is $20.00. Here is a button that charges you the extra
money for overseas orders(shipping plus the phytosanitary certificate).  $57.50
Cannot ship to Australia or new Zealand or Japan and probably
some other countries.