No..not what's in my head.. what I want to attach to an amp head..

I have been searching..and probably have over looked... but.. does anyone know where to find a dummy load "already" made.. which is just a 1/4 inch plug that attaches to "speaker out" as a dummy load.. looking for 4 ohm 100 watt.. to allow me to play and or test amp without speaker.. not an attenuator.. just a dummy load.. anyone got a link in the USA?