It is also possible, maybe not a good idea, but possible, to convert berdan-primed cases to boxer. I got a few boxes of some from a guy who had a machine shop and worked it out- remove the berdan primer, use an end mill to cut out the anvil in the case, counter bore to the correct pocket depth, and then drill a small flash hole in the middle. I haven't used the cases yet. Provided the primer pocket diameter is correct to accept a boxer primer, it should work.
If one had the tooling for it, it should be possible to do this on a simple drill press or even with a hand drill. Lots of work, but on the other hand, there are a great many berdan-primed steel and brass cases out there that no one wants.
The other clever idea I heard from someone is to convert brass blank cases into loadable brass by trimming the ends to the correct length. I don't know if the brass cases of blanks are up to the same wall thickness and strength of cartridge cases, though. I also have a bag of these converted blank things I got from a different guy, but haven't been desperate enough to load just yet. It may seem kind of silly, but if it works, well, loaded blank 308 or 7.62x39. or whatever, ammo is only a few pennies per round, about 90% less expensive than buying brass for reloading.