Spotted on the Target (US) website- Perhaps zombies just don't care for standard blue Elite darts. And the pink collectible darts of the Rebelle series- well you might as well just feed them your brains right there and then. No, if you want to really take out a mean and nasty zombie horde, you have to do it with these officially badged Zombie Strike yellow darts. Yellow gets 'em every time. Just like Green Lantern. Pack of 30, for 10 bucks US.
(ok, I have no idea what I'm on about, there's just not a whole lot you can write about dart ammo packs so I'm padding here. shhh:P..)