Just an idea, but I recently found someone who wanted two kittens by posting that a home was needed on my Facebook status, if all of us with facebook accounts post details something like:
Does anyone know someone looking for a lovely cat ......... etc etc.
It worked for me
I know it is not a brilliant idea but it may work, one comment on my facebook goes out to 200+ friends so if we all do it we would cover a lot of people in a short period of time.