I've got an Eyourlife brand that n3tfury posted above but mine is a 21" bar that goes on my bumper. I have crossed several rivers and had it fully submerged (see my avatar), driven through rain and snow, run into hundreds of limbs with it and it still works perfect.
Some people are against the cheap light bars (if you look, usually you'll notice they're a vendor who sells expensive light bars) but these bars are fine for casual use. It is not a critical part of your Jeep and unless you make a living racing Baja, the knock off's will work for what you need them to. Plus, in my case, I could LITERALLY buy 8 of the light bar I currently have for the price of one 20" Rigid light bar ($680). I will take my chances that I will never go through 8 of these things.