I lucked out on my first (VFC HK417 for $140), crapped out on the next (Zombie Care Package), and got a god-awful WinGun 321 in the previous promotion (Zombie Infestation?) but also an $85 gift card, so I sold the pistol for the taxes and shipping.
I declined this last promotion because I don't want another AEG.
I'm saving the gift card for a GBBR Mystery Box, if ever one should arise. (Zombie Flatulence?)