They were fairly common (at least in the Sacramento, CA area) in 2006-2007 time frame.
I had a couple of pairs that bred regularly and sold / gave away bunches through LFS and local fish clubs. Honestly, it was a challenge getting rid of them and I got no shortage of grief from the LFS and hobbyists for trying to get anything for bags of them.
When we moved from CA to Maryland, I sold / gave away most of the fish in my fishroom, including the spinosissimus. Guess I should have kept them, as whoever got them (they were some of the last to go and I gave them away) evidently didn't continue to breed them.
They're quite peaceful fish and not resally destructive of plants. I kept them alone as they were easily bullied by other similar-sized Central American cichlids (like Cryptoheros spilrus or even rainbows). Not hard to breed (similar to rainbows).
Hopefully Mike in Florida is able to spread them around
Matt