Milebug - Mileage Log [App Store] is normally priced at $9.99 but is temporarily priced at $2.99.
Milebug says it makes it easy for you to track your tax-deductible mileage on your iPhone or iPod touch. The price is reduced temporarily until the next update is released. Regardless which price you pay ($9.99 or $2.99), future updates are free.
Funky Punch [App Store] is a recently released fighting game for the iPhone. The developer is discounting the price from $7.99 to $3.99 during the Labor Day weekend. The discounted pricing will remain in effect until September 2nd.
The game was recently reviewed on Touch Arcade and found to be fun and polished, though some aspects of the game were felt to be too easy.