MEC is great! It's essentially our version of REI (and I order from there too). The tarp seems a little heavy at 463g no?
I've been looking for a summer type tarp and think I'm going with this one at 294g (10.5oz).
As for ordering from MEC in Canada and having it shipped to the states, unless there is a very specific item you need only available here, I'm not sure there is even a need. You guys have all the vendors down there, where pretty much nearly everything can be had for similar or even better price. Just my 2c.