Hey! I need help with my sound card

I was pondering wether i should get a sound card or not. I was thinking of using my turtlebeach px5s and i wanted to ask you which sound card i should get that would work with my px5s. I would like to keep it as cheap as possible!
Thanks! :)   GET SUGGESTING!

I'm pretty sure that the Turtle Beaches use their own sound card integrated via USB.