International Badger's Club is a society for collectors of Scouting and Guiding badges. It has members around the world, and some very useful resources, including a catalogue of every uniform badge "equivalent to, or greater than, a UK district and National event badges from all over the world".
Members specialise in collecting many different types of badges, including advancement badges, district badges, camp and event badges, group scarves and many more.
One of the more useful tools on the website is the BadgeID section, where you can upload a scan of a badge for the members to identify.
Membership price varies by country, and includes 6 club newsletters per year, access to a twice-yearly auction, a club badge (of course), and access to the list of members around the world. Many countries have local branches who meet up for swap meets. Application forms for membership are available here.