Kona Ice also does this. They were great to work with.
We have also had a local Orange Leaf franchise do the same thing with pre dipped portions. The only problem with Orange Leaf was that we had to purchase what they didn't sell because they couldn't take it back.
Last year we had Dippin' Dots come sell ice cream at our Family Reading Night. They came in, set up, sold the ice cream, cleaned up, and gave us a check for a percentage at the end of the night. They are booked elsewhere this year . Does anybody know of another company that offers a service like this?