Yes, of course also Themeforest offers website themes and templates built with Bootstrap - and not just a few. Filtering on their site with using tag bootstrap will give you nearly 5.000 results. Thankfully there are many other filter options to further drill down your search.
Often themes on Themeforest are rich of features and modules, some of them are having hundreds of different components and templates included, which can be good for developing websites with many different page types.
One tip when looking on sites likes these with hundreds or thousands of available themes to choose from is to focus on customer reviews and ratings. Good ratings, many sales and happy customers are very good signs that you should not facing many problems developing your website with one of their themes.