You can order it by the foot at hotfixqueen.com . It was the cheapest place I found (though please understand I didn't do a totally thorough search so it may be cheaper elsewhere)
Here's what I used, the cut if for you in a continuous sheet and you just cut off how much you need from it each time:
http://www.hotfixqueen.com/products.php?cat=127
Ugh I see now it's out of stock right now. If you don't want to wait for it there's some on ebay.
It will be a few days before I'm working on stuff again. With two pain shots today, a pain cream, some pain pills and a sling to wear occasionally, I can't see me getting out the tweezers and placing tiny studs anytime soon. I never knew it was such a dangerous pasttime!