Upper grabs is one of those fire pits that you can get which has the steel circle inset, as well as the curved stones. As long as you're ground is level, these pits assemble in 10 or 15 minutes.
This pit served us well for a few years, a few of the stones likely need to be replaced but that's just a few dollars a piece at stonewood products.
Most of them are only three levels high; I believe this one was four levels high, so you probably don't need any stones if you just want to stack them up three high.