there is only one R2-D2. You can get an astromech droid, though. So, you get one and it happens to be an R4-somethingsomething. Seeing as R4's are so faulty they might eventually explode for no reason.... well, good luck with it.
I wish I turned into a roach, so I would have lot's of slaves and good dinner! (I'm still in the other galaxy)