The only place that I know of that received those promo lapel pin kits is Gamestop USA.
They've been out for quite some time now. Maybe a month or more. At this point, I'd wager most of those kits have been parted out or outright destroyed.
There aren't many pins included in the kit. I haven't counted them all from my complete kit, but I'd guess that there are maybe 3 total complete sets of pins (including the pins that are displayed in the kit.)
Since there aren't many pins included, I'm guessing the pins went fast; which means that the kits themselves went fast. About 3 weeks ago I saw one of these pin cases in the trash at my local Gamestop.
Seeing that pissed me off and made me cry inside a little.
Edit: I just counted the pins from my kit, and there are indeed only 3 sets of pins (4 pins per set.) So you can see how they would go fast. Figure one set going to staff, and two sets going to customers. They may have all been taken within a day or two.