I wind up using glass beads for a lot of things when prototyping, but I've never really found a good source for them at a decent price.
Well, at least, until now.
Crate and Barrel carries them. I haven't counted them, but it's sure over 100 of them (weight:2 pounds) for $6 a bag. The one slight drawback is the colors they are currently offering them in (most likely seasonal). Light blue, orange, pink, clear, and white.
Just thought I'd pass this find along.
The Michael's here was selling a bag of 25 (red, green, metallic,or clear) currently for $2.95.
The Crate and Barrel bag has roughly 280 beads for $6. In their current season pastel colors, if you don't mind that. This price even beats the megaglass.com pricing, which seem to be the same exact bead that C&B has (notably, the opaque orange, and opaque sky blue).
Most likely, Walmart probably would have them cheaper, but I avoid Walmart on principal.