OvernightPrints is offering 500 free business cards, all you have to do is pay the shipping!
This is a really good way to get hang tags for your product for free- Get the cards printed with your logo, punch a hole in it, and then attach it to your goods. Voila! High quality printed hang tags for cheap!
You could even get a smaller logo printed 2-3 times on one card to double or triple your savings, especially if you prefer smaller tags.
And of course, you could always just get them as business cards. I had some printed that can double as a business card and a hang tag.