Proving that it's ready to enter the modern retail era, Harvey Norman is offering 50 per cent off all games until midnight 29 March.
PC, Vita, Wii, Xbox 360, PS3 and DS games are all included, with even modern titles like Mass Effect 3 and Skyrim getting the seriously impressive discount. Pre-orders are exempt (as is Modern Warfare 3 on PC, it seems), and apparently there's a "limit two per customer" rule in effect.
Just head to Harvey Norman's game page, and select your platform from the left-hand menu. Any price that's shown in red has been discounted 50 per cent.