The Canadian Superstore has cast iron 12'' frypans and griddles on sale for $6.88 each.I picked up one of each[didn't really need them, but couldn't resist the price]After seasoning they work just fine.
For the griddle, I took some 1/2''rebar and welded an ''A'' frame that fits though each handle-and voila' - I have a simple campfire griddle that holds it up above the coals.A similar ''trivet'' can be welded up to hold the frying pan, dutch oven pot, or kettle