Dont know what sort of budget you have but opticswarehouse have new 4200 elite 8-32x40 in stock.
Bri Samson on here does a nice 3D printed large target turret for them as well, for about £6.
The only down side is you can only get them with the multi X ret now & I have not found anyone who can change them to mill-dot, not even Bushnell or any of thier agents.
I had one on my TX untill the weekend. Just replaced it with an old Burris signature that I found sat in a gunsmiths when I was on holiday last week.