You can buy a single silver dime for about a dollar fifty, $1.50 U.S. But in many cases, to avoid sales tax, such as in California, you have to buy a minimum of $1000. Some popular and very busy internet dealers have minimum order sizes of $10,000 to $50,000. Shop around and buy from someone you trust like GlobalMonetaryReserve. The experts normally suggest at least 25% of your portfolio in metals, and 50% of your metals portfolio in silver.