Well the RS100 has been discontinued. The new skimmer that has replaced it is the RS135. BUT you can still find the RS100 here:

http://www.freshmarine.com/euro-reef-rs-100.html

Or here

http://www.aquacave.com/detail.aspx?ID=1322

Or here

http://www.dreamaquatic.com/euro-reef-rs-100.html

Hope that helps. If you must need the RS-100, they should be able to get you one. The RS-135 won't work? If it is discontinued, I'd go with the RS-135 for both warranty and service parts....