I cast for economics, not because I like casting, but because I like shooting. I never looked at it as a separate hobby, but the least desirable part of my shooting hobby.
For years I had lead free for the taking. Wheel weights off of big trucks. The shop at the trucking company I worked for saved them for me. When that company closed down the division I worked for I had a 55 gallon drum full of truck wheel weights. That was December of 1999. That lead along with odd and end scraps I picked up along the way lasted me until 2013.
About 2011 I found another source of not free, but cheap lead. Wheel weights from a tire shop near work. Started at $10 a bucket, went up to $30 a bucket, then back down to $20. At first it was mostly lead weights, with a few air valve stems and lug nuts mixed in. It got to where about 1/3 of the weights were zinc or steel, hence the price drop. The competition for the lead went away. That lead all went away when the shop was destroyed by a tornado in 2017. I probably have have some 400 pounds of lead left, depending on the amount of zinc in the pile I have not processed yet.
I get lead from my brother from time to time. He remodels houses and some of the older ones have window ballasts, flashing and water pipes that are lead. But it is drying up too. I save my lead now for hard to find bullets, like the 405 grain hollow base I shoot in my 45/70 Springfield and the 230 grain truncated cone I like in the 45 acp.
I can buy cast bullets now as cheap as I can cast if I need to buy the lead. I just bought 2000 124 grain .356 bullets for $0.06 a bullet.
Like was mentioned earlier, I do most of my making ingots and bullets in the winter time when other chores go away. Now i spend more time reloading. Which suits me just fine as I like making cartridges almost as much as I do emptying them!