Nope.
Bullion coins are only sold to recognized dealers in quantity. Then, you buy from them. You can buy at retail from the Mint some products - “proof” versions that are much more expensive than the underlying metal itself. Not such a great idea if you just want exposure to the price of the metal.
I wouldn’t worry about counterfeit too much. Buy from a reputable vendor. It is difficult to make a convincing fake. That’s a good thing.
Thanks for the information and advice.