There's another thread on this under "toggles" I think??? Anyways, check out bugalugbaby.com --they have alot of the toggle hairbands there. You can purchase the double-hole cord locks (cheap and without rediculous minimum purchases) at Surgical Scrub Hats Home Page
or she also has an ebay site (thescrubhatlady...I think??) Anyways, I bought mine from her and they're great!
The hairbands are super easy--just stuff one end of ribbon in one hole and the other end in the other hole...voila--fully adjustable hairband. Tie knots in ends of ribbon to keep them from slipping out.