The ESI Waveterminal U24 seems to be exactly what I need. Is there any place still selling these or does anyone know of someone selling one? Alternately, does anyone know of any very similar alternatives?

I like to listen to mp3 at home and at work. I bring my Grado SR-80's and PA2V2 amp in with me every day. The thing is, the PC I'm currently using has horrid onboard sound and the mac is somehow worse. I don't care to upgrade either computer because they aren't mine so I am looking for a...