Not sure, i make my own. The last 5 gallon bucket of wheel weights i got was given to me. I got just over 4,000 .45 out of it. So bullets are pretty cheap for me. I'll pay up to $20 a bucket, which comes out to $5 per 1k on average. I'll note that casting setup was less than $100 so i got my money back plus some on the very first bucket full.
i have yet to take my steel clips, etc... in to the scrap yard, which i'll probably end up making money.
So you're shooting your 45acp for around $2.00 per box of 50, once your casting investment is paid off..NOT bad...Bill.