Try the Spin Pin. Goody and Conair both make them. Any drugstore should have at least one, if not both brands. They actually hold my "mop" up for the majority of the day and mine is way past my shoulders!! There are lots of cute styles you can do with them.
http://www.goody.com/Products/Hair%2...s%20Spin%20Pin
http://www.hairflairboutique.com/Hai...5584-3031A.cfm