Maybe this is the wrong thread, since I'm looking for a consumer audio product (as opposed to producer audio product). I've got the Klipsch 5.1 Ultra speakers and I want to get a USB device that can output the 5.1 signal (3 stereo phono ports). Preferably Mac and Win compatible. Any ideas? I found two on USB Gear.com but that site is back ordered on both. I'd like to just walk into a store and get one. But where? (I live near Wash DC) These devices seem abnormally rare in places like Microcenter and Best Buy. Thanks--!