I've been to the states twice since I started my OOT bag shopping, and for the little tubes of Advil, you're not going to get a much better price in the states, it's about $2 there too, so grab the dollarama ones and save yourself the (increasing) exchange rate and any duty fees. Great place to buy those little gatorade packets though. If you are interested in the little packets, the Dollar tree does have them 3 packets to a box, but I figured everybody would need more then 2 advils for the week.
Okay, so on my last trip to the states (Black Friday shopping extravaganza last weekend - was the best yet!!) I sent two of my boxes to the hotel I will be staying at in Florida before we depart on our cruise wedding April 28th. I had to clear it with the hotel first to make sure they can store it for me until then, but I sent two boxes via UPS (not USPS as I had planned) and with the help of a very nice lady at the Staples UPS counter, we shipped both boxes (about 20lbs each) for roughly 40 bucks total! The boxes were the storage boxes you see in offices and stuff ('borrowed' a couple of boxes from my office). You know the kind you put file folders in to archive them? Or the same sort of size boxes that reams of paper come in for your photocopier? That size.
So yeah, 40lbs of my stuff is currently making its way to Florida. Everybody cross your fingers that it gets there and will still be there when I arrive in April! That's saving me almost a suitcases worth of luggage weight/space, so I'm pretty happy.