Target offers the Dorel Home Products Day Bed in Black, model no. 5498196, for $87.99. Add it to your cart and click through this link to cut the price to $82.99. With free shipping, that's the lowest total price we could find by $5, although other merchants charge $97 or more. It measures 37.5" x 77.5" x 41" and has a 225-lb. weight capacity.
Note that the pictured twin-size mattress is not included.