Determine exactly what a bullion sale discount is worth. Compare list price with sale price, then check whether the final price is actually cheap relative to the gold content and current spot value.
A 10% reduction from an inflated list price is not necessarily a good bullion deal. The more useful comparison is the discounted price against fine-gold spot value and the actual resale economics.
Check the discounted all-in price, purity, weight, seller reputation, expected buyback terms and whether the product has a meaningful resale market. A low price is only useful if the product and transaction are sound.
List price minus sale price, expressed as a percentage of list price.
Yes.
No.
Yes.