Believe it or not, "time with teacher." When you're in a class of 15-20, five minutes of individual undivided attention from your teacher is a prize bar none.
When my son was in Kindergarten, the teacher would use this as a reward for good behavior from him. He would have to earn a certain number of points to get it. Points could be accrued at certain key events of the day, ones that were generally guaranteed to elicit class disruptive actions on his part. It worked for a while. Long enough for him to grow up a bit and grow out of it, to a degree.
Now that he is in First Grade, they use other reward type of incentives, not just for him, of course. Being the kid selected for Show And Tell, e.g., something from their home life, personal interests, something they've learned that others may not know, a favorite toy or an interesting piece of money or something that really belongs to a parent but is far out, to them.
In Afterschool, my son has initiated something called Putting On a Play. Just one kid, or maybe a few, put on a "play" that they write... They dress up or use puppets, or all of the above, whatever works. They "write" the skits, a lot of it is ad lib, but usually the basic premise is agreed on beforehand by the kids themselves... Kind of ad hoc, kind of sloppy, probably not a whole lot makes sense to adults accustomed to bona fide theatrical productions but great great fun for the kids. Plus it is an excellent vehicle for learning about being in the spotlight, being a good listener, and taking turns. Sometimes signs are used: "The End," "It is nighttime" (everyone is asleep), "The next day," etc. Note that these are ~15 minute "productions" and there isn't really any rehearsal.
Not sure this helps, actually I kind of doubt that it does, but maybe it'll tweak your imagination to get out of the candy rut... :lol: