If you have EA Origin there is a link to a free online version of Monopoly under free games tab, if not heres a link :
http://board-games.uk.pogo.com/games/monopoly?sourceid=%20origin_monopoly This is the World Edition, you don't have to sign up to Pogo and just play as a guest if you so please.
If you are wanting a physical copy there is Hasbro Family Game Night which has Pictureka, Operation, Yahtzee, Clue (Cluedo) & Game of Life. Games are officially endorsed by Hasbro through EA & POGO. Bought this and hook my PC up to the big screen and we all sit and play something from it 1 night per week, pretty good and does exactly what it says on the tin as such!
Different areas globally do have variations but all tend to have at least Monopoly & Cluedo, only site I can find with it currently is Target in the USA so you would need to look on the Australian Google, Amazon etc.
Look for either Hasbro Family Fun PC or Hasbro Family Game Night
To give you an idea though on what you are looking for this is the Target link but they don't ship internationally :
http://www.target.com/p/hasbro-family-game-night-pc-games/-/A-13390635 EA seem to have some sort of licensing agreement looking on their site so you may need to go the Origin route or have a look on Amazon Australia.