CCI #400s at Brownells currently:
https://www.brownells.com/reloading/primers/rifle-primers/400-small-rifle-primers-1-000-box-sku749009265-79080-72161.aspx?avad=74383_d254bef09&aid=56335&utm_medium=affiliate&utm_source=Avantlink&utm_content=NA&utm_campaign=56335