There's always The National Deaf Children's Society where there's youngsters who are born deaf or have become deaf at young age and would love to have any unwanted prizes at their schools/clubs which may enable them to learn the words and understand them. I had been very lucky that i was never taught how to sign but learn to speak in the 70s and I'm also lucky that both my boys are not deaf from birth whereas I was.

There's another Deaf Society too but can't remember what it is - RNID (I think!) but the NDCS is the Children's one.