I have a vizio soundbar with subwoofer which does thentrick for me. My living room isnt huge but it fills the space well. I think they have some reasonable priced ones at Walmart. You can find a decent set under $300, especially now since it is after Christmas. Also check around Super Bowl time.
I bought a Samsung soundbar with subwoofer to match my Samsung TV. The sub is tiny though but sounds good when I turn the volume up when watching a movie. I think it has an 8" speaker in it. It can rumble. I want to get a larger sub though.
The best soundbar under $300 we've tested is the Vizio M Series M51ax-J6. It's a versatile soundbar that's great for everything from movies to music to TV shows.