|Hi Tom and welcome to the forum.|
Selling and buying is allowed, you just have to understand, this is a volunteer tech forum as OtheHill already stated, so if you have something you want to purchase, it is strictly done as one person to another and probably done though personal emails.
When you say it's an MPEG/DOS sound card, that is pretty specific. Years ago, when systems were too slow to handle high compression codecs, the hardware itself was designed to process these types of files.
Just my .02 cents, I wouldn't focus so much on a specific type of sound card and go with something more generic, such as a Soundblaster/Ensoniq ES1371 ISA sound card.
message edited by THX 1138