I have already earned the pony. I have gold and silver I will list to help others as I know how frustrating these events can be. I will list only a few at a time so players have a chance to get it. I will list first items in five minutes and continue on and off for the next several hours. I only have one item from the machine to get and keep getting gold and silver instead of the balloons so hopefully that will help someone.
Update: two each of gold, silver, and iron just listed.