If you're on eBay you probably already know about this, but if not it may interest you.
eBay is starting a petition that is of interest to anyone who imports supplies (or anything else really).
In short, the minimum you can import before paying duty is $20. This number was set three decades ago and is unfair when you consider that our major trading partners have minimums of US$800 in the United States and €150 for the European Union. You can get more info at the site below.