Digital BW, The Print

http://housewares.hardwarestore.com/35-177-sponges/spontex-assorted-
color-sponges-140509.aspx

This is what I use in my printers, you should be able to get them 
many different places. The only purpose that this stuffing fills is 
to keep the ink from sloshing around while the printer is printing, 
or when you have to move the printer. There is absolutely nothing 
special about the packing that Epson uses.

Getting inside most of the desktop printers can be difficult.