Digital Sound Card What's A Relatively Cheap Sound Card That Supports Digital Optical Output?

What's a relatively cheap sound card that supports digital optical output? - digital sound card

Hello, I have a pair of wireless headphones 5.1 I'd use, but the base station only accepts optical digital input of course) (.

The problem is that I have a sound card factory, which did not support any optical digital output, so I try to find a good sound card, cheap, but can be used for the optical digital output on my computer, the wireless base station 5.1 my helmet.

For the record, I mean the price of U.S. $ 30, small portion.

Suggestions?