I do not know for how long they have been around but I took notice of Underground Girlfight Club very recently. The catfights seem quite real with common looking girls battling each other with hearty enjoyment. The producer likes to vary the scenario using living rooms, kitchens, dorms and even basements as combat settings.
There are good moments in their tapes as you can watch in the selection below. However, there are downside scenes (for my taste) in several episodes as such as fighters tied by chains, others clad as clowns and creative ideas that do not work.
A final note: the original videos have much better image quality.