Most of these images come from the Busy Beaver Museum's official website, it's a awesome site! (You can also visit the museum in Chicago!) All of these are vintage pins and buttons and I don't know if you can buy them anywhere.
Right click on the image and select "Open Image in New Tab" to see it in the original size. All images have transparent backgrounds. No direct linking, please. Also, I would rather you give credit to the museum's website instead of my site because all I did were save the images to my computer and upload them to my own server.