I've got to brag on my wife here.

Last trip (7 days), a few days into it, she had seen a few pins that had a character and a letter on it. We later put together that the letter was the first letter of the character, and that there was an entire set of these.....26 pins in all. So, she started looking for them. She got our two oldest kids to help, and we also found out about the pin boards at the resorts/parks. Anyway, we managed to trade for all 26 pins between Tuesday and Friday. Found the entire set in four days. Not bad!

We also found out that the guys sitting in the transportation info booth at the entrance to the bus depot at the MK have a book of pins, and they're more than willing to look through it to trade with you. We stopped there two or three times, and they had some of the rare ones that we didn't see anywhere else. Just FYI.