Duke Nukem Forever -- is on-sale for me in the Steam Store for $71.99USD. (Remember that the $AUD is higher than the USD at the moment). In the US -- $44.99
http://www.steamprices.com/au/app/57900/duke-nukem-forever
See also -- $1.29AUD iTunes apps/songs
For example, I mistakenly preordered Civ5 last year. It was like US$80 on Steam. A$50 locally (I still lived in Australia then) and I could buy it for like A$35-40 delivered from the UK.
What's weird is the physical media just installed the Steam game. So I don't get why it was so expensive on Steam.
It does seem Steam's content distribution is somewhat complicated. Like Telstra has their own Steam server so will distribute Steam content to BigPond customers and possibly broader than that. So they'll no doubt get a cut for that. Steam will take a cut. But for physical media the retailer takes a huge cut. So why so expensive digitally?
The short answer is a vpn into the US (or nearly anywhere). Prices become magically cheaper and hulu starts working.