Holly, it really depends on why you are wanting to express and how often you will be expressing. For frequent expressing there is no doubt that the electric ones are the way to go, and one with a double kit is highly recommended. However, that's not necessary if you won't be expressing much.

WRT the milk banks, the PPs are correct - there is one on the Gold Coast that has just started running again, one in the process of opening at the Mercy in Melbourne and one in WA (I think that's still going). If you are not near those, then you will be unable to donate. You will need to contact the milk banks directly for more information. It's such a pity the Government didn't follow through on the recommendation to fund national milk banks which came out of the Parliamentary Inquiry into Breastfeeding. It never hurts to write to your local member though