How do I buy a product from Canada?

I want to buy a popular character plush from a seller on TikToc as a Christmas present for my little sister. However, the person is in Canada and I am in the US. How do I buy the product? Cashapp and Venmo do not support transfers to Canada.

Also the CAD price is $100, so does that mean I would send the USD amount of $71.79. I Googled and it said that that is the USD equivalent to the CAD. So, does that mean when I send $71.79 USD to the seller, would it be converted to the $100 CAD? I want to make sure she gets her money.