I am a collector of RSPB Pin Badges with their associated backing cards. If you are interested, you can buy your own from RSPB shops and from donation boxes located anywhere (try your local shops). The RSPB also have a Pin Badge Collectors Club. E-mail Mark on PinBadge.CollectorsGroup@rspb.org.uk for more information (old, rare and international badges that are no longer in production or not available in the UK can be sourced here).
You may not believe it, but at auction the rarest & best badges can go for £200 +!!!