Salut, the term I'm familiar with is "banana-plug patch cord". Banana refers to the plug, while "patch cord" is the common word for the part inbetween the two plugs.
Sorry, I don't know any source. However these cords are *no* special audio equipment but used for many electronic laboratory equipment. You should find them easily and cheaply at any supplier for electronic equipment like osciloscopes, frequency counters and the like.