This Frigidaire 5,000 BTU Window Air Conditioner drops from $149.99 to $129 in-cart at Walmart.com. Plus, shipping is free. This ties with the lowest price we could find, which is also this price at Amazon. It's ideal for a room up to 150 square feet, has a washable mesh filter, and features two-way air direction control. Sales tax is charged in most states.