I voted to just buy 'em.
For mainstream calibers, I use a lot of commercial cast bullets. Even at today's inflated prices, they're around 8 cents for big bores, and 5 cents for smaller calibers. I admit I'm a cheapskate at heart (I came by it honestly from hard financial times), but even I have to draw a line somewhere, and realize my time is worth way more than the difference.
Now, I do cast minie balls for my .54 muzzle loader. When they try sellin' ammo by a dozen rounds in a blister pack, I know I can't afford to practice with 'em. I'll go ahead and fire up the melting pot when I'm essentially getting paid $50 to $80 an hour to do it.
I also do have a lubri-sizer, Lee pot, mold, lube, and lead, all sitting in the garage. It came in a box of stuff my dad picked up at an estate auction for a couple bucks somewhere. The panic made me decide to hang onto it all, in case I don't have any other options someday in the future. But it won't see much use until I'm desperate.
For those out there who are proud of how much they save by casting, I'm willing to put my money where my mouth is. I'll take 1000 bullets, 300 (or up to 335) grains, preferably some kind of flat point, sized .452, and your choice of lube/coating. I'll pay $80 delivered (same price I bought 'em for last fall). I'm also interested in 230 grain round nose at $65 per thousand, and .32 pistol bullets at $20-$25 per 500. Let's talk.