I was looking for a cheap copy of Rise of the Tomb Raider (OzGameshop seems to be the cheapest for that too btw @ AU$47.99) when I stumbled upon the upcoming LEGO Marvel's Avengers game in Deluxe Edition format for AU$32.99 as a download code. The Deluxe Edition includes the Season Pass, which has an extra 40 characters, 5 levels, and a few alternate skins (Iron Man Starboost variant for one).
Next cheapest seems to be Green Man Gaming coming in at US$48 (or about US$37 with a 20% voucher…they always seem to have one!) which makes this a pretty decent bargain if you were considering picking it up. The previous LEGO Marvel game was easily one of the best they've done, so hopefully this one is good too.
Game releases 27/01, and you'll also net $1.65 in player points I believe to use towards your next purchase!
EDIT: For those who have no interest in the season pass, the base game can be had cheaper at Funstock Digital for ~AU$26.58
this seems good, but the annoyingly exclusive Sony DLC, makes me have to say no to the PC version