Well nearly all the big Mom n Pop type Feed stores sell em down here. Think I gave 14 bucks for the last one had a removeable lid etc. Time before that was 12. As best as I can decipher the writing on the side (it is some kind furrin language) it say in a previous incarnation it held tomater sauce from Venezueala. Wouldnt surprise me a bit if Tractor Supply had some maybe. Now nearly any of the quick lube places donate either a big one or a little one but they is awful nasty. Algore prob wouldnt want you messing with it
Now if you want to do it up right may as well order a factory model from my old pal Rocky Richmond. Just plug Big Drum Roaster into Google and you may get a few hits. Maybe at least figger out where the air holes get drilled etc..