Since I'm not seeing any commercial brass available and it's tough to find, I think I will need to buy loaded ammo or make my own brass. I compared the cost of doing so, here's what I came up with so far:
$50+ for 100 pieces commercial brass (if you can find any)
-Or
$150 for 100 rounds of loaded ammo ($30/box of 20)
-Or
$150 to roll your own 100 pieces from 204 brass ($25 for 100 pieces Win 204, $75 for #1 Form die, $55 for Trim die)
For 200 pieces it's $100+ for commercial brass vs $300 loaded ammo vs $175 to roll your own brass.
Forming brass yourself costs more than finding commercial brass, but the benefit is you'll always be able to find 204 brass any time you want brass to form it from. You can even get 204 brass free if you go to a range (I never shoot at ranges).