Black Friday is coming up, and that means it’s time to make hay for Canadian shoppers.  For some, the trip is just a swing over the border for a few hours.  For others, it’s a weekend filled with shopping and tourism. If you’re planning on spending any amount of time over the border, be sure to check in at the Duty Free before you cross.  You’ll save the tax on already discounted goods, and can take advantage your personal exemption.  You’re allowed to exceed your limit for a relatively small state tax. So long as you consume the balance of…