The prices online do not include sales-tax (at least it didn't in August when I ordered from it). There is a 5% Goods & Services Tax (GST) assessed by the federal government, and then a provincial sales tax (PST), which varies depending on province (some charge a harmonized sales tax, which is the GST and PST combined.)
Some provinces will reimburse the PST if you prove that you paid tax in your home province, so it may apply if you pay the tax in your home state - but you will have to pay the full price (GST + PST/HST) when you purchase the product.
Cheers!