So far we do have his piano quintet and a set of orchestral variations on CD, unless that's no longer available. IMSLP has his string trio, quintet, piano trio, and piano quintet in scores and/or parts, for such as are interested (and the orchestral variations too, I think.) Still, there's also two symphonies and a number of other works, and most of the works at IMSLP aren't recorded yet either, agreed.
Eric
Eric