I got a fairly good bargain on mine. I think I only paid around $30 USD for my pair, but it was a few years ago so I'm not sure. However there was good reason for the cheap price: first of all they were a mismatched pair (my Osu is black/clear, my Mesu is pink), and secondly they were used and didn't come with a package. That stuff didn't bother me back then because I just wanted to play with them. These days I've become a bit more of a connoisseur.
So it's up to you if those things are important to you - but it's also up to the fates if such a cheap, mismatched pair will be available when you decide to buy.
If you read the entire page, you will see under "shipping & handling" that they ship from Japan. I don't see why you should be afraid of receiving packages from outside your country, though.