I think we misinterpreted each other.

In my original comment, I mentioned two separated cases. First, a "some ROMs", referencing a more general landscape, and then the Genesis/MD collection from Sega specifically. And the "reasonably obtained" part is because some editions are very hard to come by, may be very expensive, and/or may be a nightmare to have the ROMs extracted from.

Then, with your reply, I thought you were asking about the former, when, going by my following reply, it would seem you were asking about the latter and that you thought I was talking about the latter too.

Would that be the case?