The SACD-M3 can be found in the PST (£6,500), Marantz SA10 (£6,000) and the Marantz SA12se (£3,000).
The Marantz 30n uses a modified version called M3L as the original M3 was just too large for the 30 series case.
All this demand for a Stellar SACD player, Marantz did this with the SA12, halving the cost. They removed all the copper electrical insulation that was a feature of the SA10 and the balanced circuits.
I think th SA12 was limited to Japan and Europe.