I have TWO M-Audio Delta 66 Sound Cards for sale: $300.00/both or $175.00/each. I installed them into my PC's and used them for about 30 minutes before i realized they were not what i needed. THEY WORK PERFECT (great for audio/studio recording) & ARE STILL "LIKE" BRAND NEW! under an hour of total usage time.
http://www.m-audio.com/products/en_us/Delta66.html
http://www.m-audio.com/products/en_us/Delta66.html