Seeking Sleeper Sofa Recommendations

Looking for a comfortable and affordable sofa with 1/2 sleeper (a.k.a. sofa bed or sleeper sofa?) for our extra bedroom converted home office. For the affordability, we have been advised to purchase a floor model. Neither style nor color is important; a cover will hide it all :-) No Walmart nor Target nor Kmart quality please. Thanks in advance for all helpful suggestions.