2 Cozeware Air Conditioners, $459 Each

Cozeware's 12,000 BTU 20 SEER2 Mini-Split is already down to $509.99, $30 less than Amazon's $539.99. But buy two and an extra 10% kicks in automatically in your cart, dropping it to $459 each. Buy three and it's 15% off, landing at $433.50 each. Whether you grab two or three, the extra discount makes these the lowest prices we've seen all summer. It's not a stripped-down unit to hit that price, either. The 20 SEER2 rating means it runs efficiently enough to actually lower your cooling costs instead of just shifting them, and the same unit doubles as a heater for up to 750 sq ft come winter. Backed by a 7-year compressor warranty, free shipping, and 30 days to send it back if it's not the right fit.