Ask at your library, we got a couple from there, can't remember the names tho sorry.
We also took DD to the appts to listen to baby and see the u/s. We got her talking to baby in my tummy and got her to help set up the bassinet, wash babies clothes etc.
The books were good because it explained how grandma was going to come over and mummy go to hospital and then baby come and live with us that sort of thing.
So far DD1 has been great with DD2 and I thik all the preperation worked cause she did seem to understand quite well when we brought DD2 home.