Slip, you're not confusing closed back HD 598 Cs with open back HD598 SE? I have seen prior for a $100, but never later, at least not on amazon. Year ago they were on 1 day $107 price or so
Actually, you are correct on 1 point, but also mistaken, it seems.
I did indeed purchase my 598SE on release for the $107 price point. When I did a price history search on camelcamelcamel, it does look like that was the only time those hit that price point.
But, the 598 (non-SE) also hit the $99 price point along the way here, so that must have been what I was referring to:
https://camelcamelcamel.com/Sennheiser-HD-598-Over-Ear-Headphones/product/B0042A8CW2?context=search
And, yeah, to be fair, I don't think my comment of "$100 from time to time" is exactly accurate. Probably better to say, "If you get lucky you might find them for $100 on Amazon".
So.....what's the story on the closed back Cs model?