I'm looking at the humor in the original question:
"Looking for good sources of free chain bead."
How about bad sources or would they be illadvised? But really, c'mon. You've probably spent a lot of money on your fishing and tying stuff so now you're looking for 'FREE' Stuff'. I guess I always find it interesting that fly fishermen spent 000s of dollars on rods/reels/tying stuff(if they tye) but balk at the price, even when they're very cheap, for a decently tyed fly.
Anyway, maybe you'll find some source, good or bad, for free chain beads.