BuyDig via eBay offers the Honeywell 21-Pint Indoor Portable Evaporative Air Cooler for $169. Apply coupon code "P20MEMDAY" and check out with PayPal to drop the price to $135.20. With free shipping, that's the lowest total price we could find by $19. It features a remote control, low water alarm, and timer. Deal ends May 29.
Note: This coupon can only be used once per PayPal account within a single transaction.