I only use pickups. The only new I have ever used is new ammo that I shot and then re-used the cases.
I typically chuck them in the tumbler for about an hour and then pull them out and inspect them as I decap and size them. It cleans them up so I can see for cracks and such and it keeps my dies a bit cleaner. 9mm brass is so abundant that I'm pretty picky when it comes to keeping it and I still get a ton of uses out of it.