How about other input connection like CD-IN, AUX-IN, ... Not sure if your card has that, but my SB Live! Value has those inputs.
But I think making one yourself is much cheaper. All you need is a 4PDT or 3PDT relay and couple of male/female 3.5mm jack/plug.
Or go to walmart game/audio/video section and pick up a Video/audio selector box + 3 set of RCA to 3.5mm cables and call it a day.
well my problem is i cant use a pci sound card as my case is about 6" x "8" x 2". I need an external sound card with an aux-in or cd-in. If i could find one i'd buy that before the selector. Muting the line that needs to be muted is done through the front end (in my case Road Runner)