: Buying entire collections directly from the public or through estate sales often results in the lowest per-unit cost, provided you can verify authenticity. Where to Sell Coins - American Numismatic Association

: Registering as a business can allow you to purchase coins without paying sales tax, which is essential for maintaining profit margins when reselling.

: Large companies like APMEX and Elemetal act as primary suppliers for smaller shops, offering bulk silver bars and gold grain.