On boxing day, I got a nice deal on the first half of the first season from The Right Stuf. Probably comparable prices to, say, Amazon.ca most of the time, but they have weekly specials, so you might want to check back every week and see if any FMA goes on sale.
Use the same deal I did to get my first two sets. Second two sets I got Goomba to pick me up at the BOGO at FYE. However, due to FYE's ridiculous pricing, this deal gives you basically the same price: http://www.cheapassgamer.com/forums/showthread.php?t=184466
Since it likely won't ship all at once, there's a higher chance you'll get past customs I think. Of course, more chances of being hit by customs. I never got charged on them. Others have. So YMMV!