I bought the original PCI version of the SBLive (Value) when it was released and it did come with a DOS driver. Should be one out there. I always used it with Windows and the latest drivers, so never tried the DOS setup and I'm not sure if I have the CD.
If you can't find them, I'll take a look tomorrow. If I have the CD I'll either send you the drivers or host them for you to D/L.