Uncharted 2... FREE.
Of course it required purchasing a PS3 and a 46" Bravia... But due to BestBuy storefronts actually competing with Besbuy.com on CyberMonday sales, we came away ~$200 less than the actual online deal was going for. (All told, the game AND the PS3 were essentially free compared to the TV's normal price.) Savings went right in and helped pay for the beginnings of the game and Blu-ray library.
For just a straight-out sale... Purchased StarCraft Battlechest in bargain bin for ~$10 years ago... Lost the BroodWars disk through several moves, but when I registered on Battle.net with the remaining StarCraft registration number, I got the BroodWars installed via download again for free.