Yep, there are a lot of them out there. The easiest way to find them is Google "soundbar with built in subwoofer" and you will get enough results to look through for days.
Amazon, Dell, E-Bay, Crutchfields, Best Buy, Sam's Club, HSN has them. So does almost every electronic AV supplier on the internet. Prices vary a lot depending on how high $$$ or how low $ you want to spend. There is also some variation in price for any given model but not a whole lot.
Hope this helps.