These are starting to show up on eBay, so they must be in the parks.
A few more details on the droids:
MB-12: burgundy BB-shaped unit
LM-7B: white, black, and blue R4-shaped unit
AR-L5: blue BB-shaped unit
M5-K7: white and orange R2-shaped unit
SC-97: tan BB-shaped unit
J1-B2: white and silver R4-shaped unit