Just in case you couldn't wait to get your hands on one of those extremely gross real-life Mana Energy Potions we posted about a while back, now's your chance: ThinkGeek is selling them at a reasonable price (even though actually drinking them probably isn't reasonable at all). As mephron points out on WoW LJ, the nutritional stats are atrocious: B12 is definitely good for you, but putting 6667% of anything's daily allowance in your system just doesn't seem right.
And Robin was right -- these have a ton of caffeine in them. ThinkGeek says there's 160mg of caffeine in each bottle. That's not exactly lethal, of course (the lethal dose is about 150mg per kg of body mass), but finishing off a six pack of these over a weekend of gaming will not be good for us. Still, if you want them after all that, there you go.