Your talking about the small sponge spit pad that the head passes over all the time.
I take it out of the plastic holder and lay it flat between two clean rags and pat to absorb the ink off the sponge. If you do find an alternative cheaper source I would like to know also.
I have seen some people leave it in a phone book overnight to flatten and dry out as well.
Have not seen a phonebook in awhile, but sounds like a good idea.