Mohu basically created the modern HDTV antenna market, and you can save 30% on two of their newest amplified models - the 40 mile Metro Plus, and the 65 mile Glide. Now, those mileage figures only apply under ideal circumstances—basically flat, uninterrupted terrain with no buildings or other interference—but the Metro should be more than enough if you live in a city, and the Glide ought to work if you live near a city.
If you’re really looking to save, a bunch of open-box antennas are also 50% off with promo code OPENBOX50, with non-amplified options starting under $10.