AC: Shadows game vouchers

I have been out of pc gaming for the last 10 years but I'm going to dip back in with the B580. I was able to snag a Sparkle from Amazon at MSRP (ETA delivery in March) but I don't see any description of the Assassin's Creed promo I see advertised at Microcenter and I think a few other places.

Is the AC game voucher specific to purchasing only through certain retailers?

I normally wouldn't care too much but it would be nice to drop directly into a new game to show the card off without any further up front costs.