I just re-read my post, and I was pitifully unclear. I'm referring to the ability to control flash levels from the command unit. As pictured above, Flash A is at 1/64 power, and Flash B at 1/8. Are these flashes the same brand as the camera, or are they Godox flash units, or...?
I believe, for features like that, the commander and flashes would have to be part of a proprietary system. But, I'm no expert on everything that's available, so maybe not.
My current flash system is Yongnuo, consisting of four 560 III's and the command unit, which mounts on the camera hot shoe. I can enable/disable, set the zoom, and power in 1/3 step increments, to each flash individually, all from the CU. However, the only communication between the CU and camera, afaik, is "fire the flash". But again, I have to set all that up from the CU and flashes - the camera has no idea what's going on and isn't really controlling anything.
And so as to not completely hijack the thread...to the OP:
I don't think you could go wrong with just picking up, say, a Nikon SB 23 and cord (SC 17). Probably looking at around 50 bucks or so...