I picked up a propane fire pit at Sams Club last summer and have been glad I did. You get about 6 hours on a 20# tank on high... maybe 9 hours on low to medium. Plenty of flames on low, but higher heat generation on high for those cool nights. I grill hot dogs, burgers and steaks in a wire basket over it. You cover the lava rocks with a metal cover that latches on when traveling and I haul it around in a carrier hanging off the bumper. Road vibration does grind a little dust of those lava rocks so I keep it outside. Probably weighs about 35# plus the propane tank of course.
I now take issue with campers that purchase that crappy (and expensive) camp firewood and build smokey fires with it... especially when the smoke blows over into my campsite. In less then one season, I know that I have saved enough from buying wood to pay for the pit.
I searched SAMS online for it just now and don't see it online... as I recall I think I paid about $80-90 for it. I also searched Amazon and still see nothing like it in that price range. It is about 2 feet in diameter and sits about 12 inches off the ground on three sturdy legs.
I even took it to NFL tailgate parties. Turn it off and it is cool enough to pack up in about 10-15 minutes.