Don Maslin wrote: keytronics doesn't sell them anymore. they used to charge $0.10/pad. They gave away mfg rights to a 3rd party who charges $0.50/pad. You can read about it and see a keyboard rebuild on my web page: http://www.thebattles.net/sol20/solkb.html What I did was find a couple Sun "type 4" keyboards on ebay for $5/each. Note that model 5 uses a polymer membrane sheet instead of individual foam pads. Although the type 4 keyboard is going to be at least 10 years old, the foam seems to be in decent shape (perhaps the type of foam used in 1990 is better quality than the foam used in 1977). heck, there are at least six of them on ebay right now. Use this as a search string from the ebay home page: sun "type 4"