Kieffer Bros. have a bunch of great puzzle games, Bossa Studios has some stellar PC ports, there are also some award-winning digital board games, Apple’s freebie of the week, Sputnik Eyes and loads more.
I’m not sure if these are pre-Easter sales, GDC sales, or in honor of Monday’s big Apple event, but I suspect some of these price drops won’t last much longer, so grab them while you can.
UPDATE: It looks like a number of the sales have ended, but still some decent ones left.
Note that App Store prices fluctuate frequently and there can be some propagation delay, so the prices above may not be correct. Always make sure that the price is correct before clicking 'BUY'.