Missouri Bullets has pretty much all calibers in stock for cast lead bullets and at normal prices. I ordered 500 each of .357 SWC, .452 SWC ACP, and .452 RNFP Colt bullets and got them in about a week. The webpage stated delivery could be up to 14 weeks but my order was here before I knew it. Midway had pretty much nothing in stock when I checked there.
https://missouribullet.com/index.php
https://missouribullet.com/index.php