Forgive me if this has been posted already. I looked (a little) and didn't see anything about it.
Anyways, I originally found it at the GameFAQs boards, and have confirmed said price-drops at Gamestop.com.
http://www.gamefaqs.com/boards/genmessage.php?board=8&topic=50654336
http://www.gamestop.com/Stores/thedeal/
http://www.gamestop.com/browse/search.aspx?N=73
GameStop has drastically dropped the price of a variety of titles across the board. Titles available for under $20 brand new include:
Animal Crossing: City Folk
Donkey Kong Jungle Beat
Excitebots: Trick Racing
F.E.A.R. 2: Project Origin
Lair
MadWorld
Mario & Sonic at Olympic Games
Silent Hill: Homecoming
Street Fighter IV
Wanted: Weapons of Fate
Wario Land: Shake It
Wii Music
I couldn't find any official sources that state it ends Sunday - I think everybody's just going by what time Gamestop deals typically end - but still. I'd definitely assume it ends Sunday, and move quickly.
I already picked up Animal Crossing, Wii Music, and Street Fighter IV. Sixty-dollars for all three? Ridiculous!
also: Yes, this deal is the so-called "Gamestop New", but if you request a factory-sealed copy, you CAN be provided with one if they have it.
Edit: Thanks to radioioRobert, this is confirmed lasting only through Sunday. Move quick! Pick up your copies soon!
SW-5120-1900-6153