Electronically, many flip-flop ICs can be made to toggle with pulses.
Google for flip-flop toggle. Advantage is that any device may be 
driven from the toggled output.

    RM

> I like the idiee op the relay with the spare pole the most for this
> application.

>> > I need to very simple and cheap circuit that will toggle a relay
>> > on and of on a pulse input.

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