My Mordin died a rather pathetic, and entirely unintentional death at the end of Mass Effect 2. Seeing as a little plaque on the Normandy is hardly a fitting tribute to a "man" of so many talents, I might look into this bust for a memorial instead.
Priced at $40 and being sold from BioWare's store, it's not very big—it only stands 8" tall—but for that price, you shouldn't be expecting something life-size.
Mordin Bust [BioWare]