What are the best cheap noise cancelling headphones available?

By Grissom 　http://www.noise-cancelling-headphones-reviews.com/what-are-the-best-cheap-noise-cancelling-headphones-available/

I am currently taking a class where a lot of work is done online listening to audio lectures though headphones while other people are talking or making noise around me. I am looking for a good, cheap pair of noise cancelling headphones under $100. Does anyone have a good recommendation?
Im looking for specific brands and styles