You might be able to find the campfire cascades new (I’m not entirely sure if they are still in production) and the fostex TH 610 are still a good option. They use the exact same driver as the TR X00 line but have a less fun, more neutral tuning for about $600 new. The same lawton mods and pad swapping will work for the TH 610 as the TR X00s.
It’s also worth looking into the maze 99s still. I don’t think I’ve heard anything bad about them really other than Maybe tha pads are a bit small. Check out the full thread if you want.