I have a Rane RA1 that is part of my RA27 analyzer. This mic is similar to the ECM8000 in appearance, but the capsule lineage is unknown to me.
The Rane requires a peculiar phantom arrangement, about 9v, I think. I don't have a problem with this, except I have to fabricate a power supply for it, and I'm lazy.
I have a line on a cheap ECM8000 right now, and was just curious. I suppose it is probably worth $25 or so. I'm only interested in 30 to 200 Hz response.