Range foundlings. Definitely. Especially a rural range where the local LEO's train will often have brass that is, ironically, not policed.
If you go to buy brass, buy good brass because it is more consistent in case volume and dimensions. Try Scharch Manufacturing's
Top Brass or
Starline. Get 1000. This will cost you a little over $125.00 plus shipping. Figure you will get a minimum of 10 loadings out of each case, (more, but you lose a few cases over time) and much more if you load to target levels (25+ reloads are not uncommon for wad loads). So, you will average about $0.013 in brass consumption for each round. Add nearly $0.02 for primer. If you run a 5 grain load of powder, at $20/lb, including sales tax you would be out another penny and a half for powder, then you've got the bullet. You can usually get H&G 68 style 200 grain cast SWC bullets for around $60/1000, so the bullet costs you $0.06. Total: Now about $0.10 a round, or $5 a box. To beat this price down, figure to start casting your own. You can often get wheel weights for free. Where you can't, the scrap yards typically pay about $0.20/lb for the scrap so if you offer the local tire repair $0.25/lb, they may well bump the scrap dealer in your favor. Figure that after pulling metal tabs you get, say, 25 bullets per pound, that's $0.01 per bullet and then you've got to lube it. Still, under $0.02, I'm sure. Anyway, this gets your reloads down to $0.05-$0.06/round and $2.50-$3.00/box of 50 loaded and ready. Of course, I am assuming your time is donated free of charge.
Nick