You can purchase coins from the US mint. It is safe to purchase coins from them because you know you are getting what you bought because they make the coins. The link below has there website.
Yes
The US Mint produces circulating coins, commemorative coins, and bullion coins for the United States.
The best place to purchase Commemorative Coins is the US Mint. You can shop online. They have so many different commemorative coins available, it can be hard to choose which ones to get.
The US Mint
The us mint
A 1955 US Mint set contained 22 coins. It had 2 coins from each Mint that produced coins for circulation. All US Mint sets from 1947 through 1958 are double sets.
Silver coins can be purchased from a number of places in the US. You can purchase silver coins directly from the United States Mint, and most cities contain many stores for buying and selling silver and gold coins.
The first coins made by the US Mint was in 1793.
Platinum Bullion coins are produced at the Philadelphia Mint and West Point Mint.
you can get coins from the mint by ordering the coins through the us mints web site follow this link www.usmint.gov.
One can purchase platinum coins when one goes to the official website of US Mint. One can also go online to websites like Apmex, Amazon, or eBay, etc.
US coins minted before 1979-1981 (the exact date varies with the coin) don't necessarily have a mint mark. Coins without a mint mark were minted at the US Mint facility in Philadelphia. Since 1981, all coins except for the US cent will have a mint mark; for Philadelphia it will be a "P". US cents, often misnamed "pennies," minted in Philadelphia still do not carry a mint mark even through 2007.
U.S. Mint, Littleton, or anywhere else that sells the Presidential Dollar Series.