Thank you to everyone for giving me some ideas. I've checked into each one of the sites you've mentioned. What I can tell you is that many of these sites don't have ball chain in the size I need, which is 2.4mm or smaller, and no one seems to have the colors I'm looking for. grrr.
The easiest colors to get seem to be blue, red, black and white. What I need is pink, green, yellow and other pastel colors. Metaliferous had some great stuff, but the ball chain is too big. It would be more suited to key chains than necklaces. So... I'm still stuck. Ballchain.com has the basic primary colors for a good price, so I might go with them.
Take a look at these pics to see what I'm talking about.....
<A TARGET="_blank" HREF="http://www.artyfax.com/jewelery/Gingerbread/Gingerbread%20collection.html
">Ball Chain Colors</A>
Aren't those colors great? I contacted ArtyFax about the designer for these necklaces but they never responded. Back to the hunt.