As above, either Box One, Two or Three. 9 speed 11-50.

Anyone?

If you already have a 9 speed shifter/rear mech then I’d go Sunrace 11-46 and get a cheap rear derailleur extender off ebay.
There’s been threads on here of people using old shimano/sram stuff for this.

Currently running 12speed SLX but I’m not convinced the durability is up there. Fancy a one-brand solution and the Box simplicity appeals.

I’d been interested in these; where would you get the whole lot from? Microshift Advent would be worth a look too. The only thing that concerns me would be how long they’d stick around and cross compatibility.