With new iterations of Diablo and StarCraft in the works, it's as good of a time as any to pick up either series from the very beginning. Amazon has got an incentive for you to do just that, namely a price reduction good for today only.
The Battle Chests for StarCraft, Diablo, and Warcraft III are all half off, which means $9.98, $19.98, and $19.98, respectively. Yes, this isn't the first time these collections have gone on sale, and it certainly won't be the last, but if you haven't played these timeless games yet, you owe it to yourself to impulse buy them.
What are you waiting for? Go throw fistfuls of cash at Amazon while you still can.