The Sears stores around here were all actually honoring the price. Unfortunately I'm a complete idiot and didn't go to them when they opened, despite the fact that I had been awake since something obscene like 4:30 AM. When it came time for them to open, a wave of doubt swept over me and I postponed the operation for a few hours. So, so stupid.
As for getting the deal, endless trial and error works. Best Buy was the first store I tried, and the clerk price-matched it for me even though he knew both that Sears had made an error AND that they were sold out of it. He was just a sorta chummy guy who really liked the game and felt like being cool, I guess. He also wanted to do the deal himself after work, and was really glad I turned him on to it.
After that, though, it was flop after flop. I tried Target, TRU, Wal*Mart, 2 Circuit Cities, Fred Meyer, and a couple other stores, and all of them denied me. I'm not complaining too much, since I got the game and all, but it could've been so much better if I hadn't been so lazy about getting to the stores early in the morning.