Compact Appliance offers the EdgeStar Portable Air Conditioner with Dehumidifier, model no. AP12000S, for $299.99. Coupon code "COMPACT10" cuts it to $289.99. With free shipping, that's the lowest total price we could find by $10. This 12,000 BTU air conditioner cools up to 425 sq. ft. and features three fans speeds.