Cheapest ain't always best.
APMEX has been 100% reliable.
At the time I was interested in metals, I recall people touting the prices of Scottsdale Gold & Silver. Then complaints. Over time, many tears about how late the shipments were, how hard it was to get a hold of the guy.
Then the reports.
https://ktar.com/story/4841922/owner-of-scottsdale-gold-and-silver-investment-company-wanted-for-fraud/