Tink's store, just on the other side of the Castle. You have to walk REALLY fast during rope drop, avoiding all the people racing to Splash and Big Thunder, run (oops, walk briskly) through the Castle and into the store. If you are good, you can race there, wake Tink, race over to Tom Sawyer Island, find a paintbrush, then go back and ride Dumbo before the line gets long! (yep, I've done this a couple of times....)