I got this set of small files from a vendor selling hardware store closeouts and the like, at a woodworking show:

[ATTACH=full]104172[/ATTACH]

The shapes/profiles are a square-edged flat file; a round file with a narrow tip; a file with a triangular profile; a file with a square profile; a half-round file (round on top, flat on the bottom); and a leaf-shaped file, runs to a narrow point like a blade of grass.

I think I paid five bucks for it, ten at the most.  It has served me well for nearly 20 years.