Poster Hangers

I have a few posters* which are currently attached to the wall with yellow-tak (the sticky stuff which melts, so the posters keep sliding floorward.)

Does anyone know where I can get poster clips to hang them with ?

Something like the thingies pictured at

http://www.teacherstorehouse.com/product2....gory%5Fkey%3D42

only I wish to attach to the wall rather than suspend from the ceiling.

(*of the paper kind, not the forum kind )

Thanks for any info.