We went in August also and I bought lanyards from ebay for $2.50. They had a little change purse on the end of it and it was wonderful for carring money, room keys, tickets, etc..... I also bought pins off ebay. I got 40 pins for $60. (I shared with my mom and my DH.)
When we got there, my DD, nephews, and niece wanted to do it so we had to buy them lanyards and a set of pins...but since we had so many, we gave them some of ours too. they had a blast. Their ages range from 5 to 11.
I will warn you though.....You trade off the pins you dont like and end up with pins you LOVE and dont wanna trade and you have to buy more so you can trade them....LOL
Its a blast...