You could recycle those metal CD cases(like AOL sends out) and put a (new, clean)sponge into the case and drops of ink onto the sponge to be able to use as an inker for stamps. The brand I have done this with is O-cello sponge cloth. It is thin, like a compressed sponge and when you dampen it it plumps up. You can cut it with a regular scissor to fit into the container. A plastic travel soap dish works well for the sponge too if you don;t have the CD case, helps keep it damp.