I love the idea of the Radio Flyer Fire Pan!! Unfortunately, here in early 2013 the word is out on these wagons, and unless you find a deal at a garage sale, you're almost better off buying a new one....UNLESS you just buy a wagon "pan" directly from Radio Flyer! [Seriously, used ones are going for $60 to $125 on Craigslist and Ebay; Walmart sells the new ones for $80.]
Radio Flyer (800) 621.7613 select 3 for sales. Pans alone are not listed online.
Radio flyer makes 2 sizes of metal wagons--the "Classic" at @ 36" X 18", and the "Ranger" at @ 34" X 15". Same 22 gauge steel. The "Classic"--pan only--is $50; the "Ranger"--pan only--costs $30--plus tax and modest shipping to California.
For $73 I've ordered 2 Rangers and will attempt the pan and lid conversion shown earlier in this thread. I'll even steal the vents from a couple old Weber Qs, because the pan-to-pan fit will be exact here, as opposed to getting different sized pans like the Mogur used. I'll drop a couple pins in the lips when the lid is on to keep it in place. A Char Broil OE 8000 Grid from Amazon will complete the deal.
The only drawback is that these will not nest as nicely as Mogurs, BUT, a tight, fire-extinguishing seal can be made for safety and to save coals for the next use.