A few have actually come up for sale on the marketplace here from time to time.
@AlmaxMere I really like my SubH, but it is kind of its own thing. It makes beautiful tones but it’s also quite limited in a way (check out the Subharmonicon thread on here, there are some good demos and contributions: Moog Subharmonicon). When paired with other semimodular gear and effects it really shines (I have mine racked with a DFAM, and use it with an A4 which provides sequencing, FX, modulation). So it should fit nicely with your setup, but it kind of comes with a different way of working and IMO you need to work with it mostly in a happy accident kind of way, which can be a good or bad thing. Like the DFAM it rewards more time spent with it.
A M:C (I don’t own one) would be much more flexible and immediate. I guess it really depends what you are looking to do!