If you want used, there's plenty to choose from.
Just do a web search for once fired brass and the like.
You're bound to find what you want, there's so many to choose from.
I've got a few thousand once fired. How much do you want, how much do you want? $14 for priority shipping, medium box,I think that four cents a round is fair, it is all clean, bright, polished,and you'll still get a few extras in case of duds.
Today www.oncefiredbrass.com shows 9mm 250 mixed headstampts for $5 (once fired). That amounts to 2 cents a case plus priority shipping. Briandg also shows a good deal, cleaned and polished. If you want more than 250, take his offer. Sometimes oncefired only allows the minimum amount per order.
If you want me to, I have time on my hands and will also size, decap, expand them for another penny each 14 is the cost of the shoe box sized flat rate.
9mm pistol brass. Got most of mine from a out-door club range. Range sells Federal ammo if a shooter needs it.. Most of what I have are first fire yellow brass Federals.
Being a club member all brass left behind by its shooter is free for the taking. Those that aren't F/fires, but still re-loadable. Once I reload those types they get shot and dropped. Same applies to my rifle brass.