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Looks like GameStop Impulse is starting to publicize their daily deal a little bit more. There’s a box that shows their current DD in the side menu.
Dark Void is on sale for $4.99 (50% off) as the Impulse Daily Deal for 9/28. The game only has a 57/100 metascore though.
Their current Capcom sale is the cheapest I’ve seen for some time on Dead Rising 2 for example; so they do have some decent deals.