It sounds like you got everything out of it. Without a sticker book it's hard to confirm but if you've spent a lot of coins in the machine, you may well have purchased everything it has to offer.
@PoppetGirl1234 I am sorry, noone here can help you with this issue anymore. I have the same issue as many others does. You'll just have to be patient, follow news and wait for the team to add more stuff to reward-o-tron.
Nothing will ever be added to Reward-o-Tron. Once you've emptied it out, the only way for new stuff is monthly prize map or buying them from Rux.
Now that people are paying money for new Rux stuff, there is ZERO incentive for Popcap to add to Reward-o-Tron.