The Best Buy deal is still going on. It's not a glitch, since it says right on the deal page that the discount applies to the higher-priced item. Unfortunately, it doesn't look like you can checkout with more than two at a time, as I tried adding four and the discount didn't work. I just added some preorders to two separate orders in order to get the free shipping for $35+ (you can mix shipped/in-store pickup items). I picked up Hijinx/Eye Small, Head Rush, Tread Head, and Hog Wild Fryno for about $25 plus tax (after GCU).
As for the Light and Dark packs, Amazon gets them in at MSRP quite often, but they sell out very quickly. Just keep checking back and you'll eventually get lucky. I even happened upon the Kaos trap at Amazon for $5.99, but it sold out before I could add it to my cart.