I picked up one of these back around Christmas as a present to myself:

https://www.amazon.com/HellFire-Heav.../dp/B0822ZPKB3

I've been able to use it twice so far, and have been very pleased with it. It's reasonably easy to assemble, and once you get it going, it gets quite hot; I've used it to grill burgers on my cast iron pans twice now, and have been very pleased.

Only complaint I have is that after some time (maybe 40 minutes or so) it doesn't necessarily want to stay as hot; I think it may be because it accumulates pieces of charcoal that are too large to fall through the grate at the bottom or it could just be user error.