I went back home (Detroit area, Michigan) this weekend for Memorial Day and all. Since I live in Mt Pleasant while going to CMU and there is no Best Buy or Circuit City even remotely close, I felt kind of left out on the $5 deal. When I got back close to home one of the first things I did was visit Best Buy, unfortunately they were out of every $5, no big surprise, but somewhat disappointing. Later that day I went over to CC in Westland, MI. I showed an employee the $5 game list that I had printed off of gamespot. He seemed a bit surprised and went and checked the BB website to see if he could find any of the games. Finally he ok'd the deal, but then his manager stepped in and this woman made him call BB to see if they had any of the games in stock. They only had Freedom Fighters, so she reluctantly sold it to me for $3.49. I felt like I had gotten a good deal, but I still thought I could get more. So, I went to another CC, this one in Novi, MI. Walked in grabbed Sphinx & The Cursed Mummy and Wario World, went in to the front desk showed them the deal the cashier didn't even really look at it and gave me the 110% matched price. Finally, on my way back up to Mt. Pleasant I made a stop in Lansing, since it was on the way and went to their CC. The guy there said they would not price match ANY of the $5 games, however, I did find Waverace Bluestorm, marked at $40, but it rang up $9.96, so I got that.
Summary: Obviously this is an extreme case of YMMV. It all depends on what manager is working, what time of day you go (I went near close the first two trips), and how much the cashier cares. If you have several near by CC's I suggest trying them all, Wario World, Waverace, Freedom Fighters and Sphinx (all for GC) for under $20 total was well worth it to me.