You can see the number of videos if you click "Videos" under "Browse" on the left of our homepage.
You can choose any of our filters, and the number of videos will appear at the top. As shown here: http://screencast.com/t/dcL1tJuY
If you don't have a FluentU account yet, just let us know which language you're interested in, and we'll check the exact number of videos for you. Please send us a message