Any way you slice it, this sale is going to be a mess and there will be people sorely disappointed. They'll be disappointed because it'll be an error, or it won't... and I don't have enough faith in humanity that I'll get anything noteworthy... and I think a lot of people will be in the same boat, unless electronics staff are smart enough to prevent people from clearing them out singlehandedly.
I don't need to add to the backlog, but there's at least one Wii game (Elebits) that's pretty high on my want list and is well worth the hassle to get for this sort of price.
(If it is an error, I could definitely see the error being: Buy two $59.99 games and get them for $40 each. Still a good deal, but not fantastic).