The title says it all, really. If you've seen some incredibly priced games, post them in this thread, along with details such as where and how long the sale goes for, if you know it.
And I'd definitely recommend checking Pal Gamer Network for game prices - they have info on various stores almost weekly.
Anyway, if you have a Games Wizards in your area, hightail it there and grab a copy of Shining Soul for only $19.95. I know I did. Sale lasts until the end of the month I think - you have to be a Gold Card member to get the special, but membership is free, and there's a lot of great deals.
Wow, I feel like an advertisement.