Ibotta should have a secret item of the month. You have 30 days to buy that item. Clues to what the secret item is should be given weekly. The secret item should be based off items you already buy. A reward should be given for buying your secret item.
Occassionally there has been a secret items in the app, however I haven’t seen any lately
This would be fun... but might go against the whole “saving money” premise, as I might find the challenge aspect too tempting