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Walmart [walmart.com] has 20″ Lasko Weather-Resistant Motor 3-Speeds Box Fan (B20200, White) for $19.87. Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $35+ or choose free store pickup where available.

Details via Walmart:[list][*]This 20-inch Lasko box fan moves up to 1,710 CFM, rapidly circulating air through bedrooms, kitchens, and home offices.[*]A weather-resistant motor allows safe window placement to pull in fresh outdoor air or exhaust stale indoor air.