Since Disney parks aren't as open as they once were, you may have to go to the secondary market to get your BB Unit (Color-Changing Droids, Droid Factory Line Look).  It's a good one - it's red when hot, black when cold, and opens in the middle.   You can get it in a 4-pack with a Chopper C1 Droid, a R! droid, and an R2 unit.  Read on!