PSH had Kovalchuk overstocks a while back, but the lowest flex they had was 85, I think. Some PSH Kovys were up for sale 6-8 months ago on Kleinanzeigen (eBay’s more local classified platform in Germany; a random treasure shows up now and then). I think they were new Kovys. Those are the only times I’ve seen that curve on anything. He’s got that box shaft shape a lot of people dislike.
I've tried his 90+ flex from a former coworker of mine and I agree about the boxy shaft. I bought two Dean Ostrovsky sticks on PSH, which have standard-shaped shafts. The curve is the exact same, but the flex is a bit stiff since I had to cut them down. I'll most likely stick with my PRO sticks, but am always on the lookout for the new Kovalchuk RH 70ish flex unicorn.