I wanted to report back on my experience with this company. I got my order and all went well with the transaction. They did indeed refund the overcharge on the tax. They were out of stock on one of the colours I ordered :( but they did include a little package of reallly pretty flower shaped buttons.
So, all in all, I'm happy with my purchase and they were easy to deal with. I would recommend them - especially to the Canadian crafters looking to not be gouged on shipping.