Yes, the FDA has cleared the Good Morning Snore for Over-The-Counter (OTC) Use, as an aid in the reduction of snoring.
In order to receive FDA Clearance, a product must be proven effective and must also undergo very strict safety testing. There are many anti-snoring devices sold online that are not cleared by the FDA, and there is no way to ensure that those products are effective or safe for consumers, or legal for sale.