WOW finally something I can help with.
Scheels has some, back near the camping stuff.
The best price, (but not the pink my daughter needs for her sling project) I have found in Lincoln, is at Closeouts Unlimited- the little tools store on Cornhusker (between the radion station and Virginias Cafe)
The have a good assortment of colors and lengths. Also for some awesome knots, braids and such see TIAT on youtube, A fellow Cubleader turned me to him. He has a cool one size fits all bracelet made by using a ponytail holder inside.
( I also found some at Canfield's in Omaha, but Closeouts price if better)