Marine Gifts Where Can You Buy Authentic Marine Corp Merchandise/gifts (not Knock-offs)?

Where can you buy authentic marine corp merchandise/gifts (not knock-offs)? - marine gifts

The Marine Corps or the military as a whole is have a website to buy goods or gifts? Looking for a gift for someone who is an ex-Marine who loves everything that has to do with the Marines. I would rather have my money goes to the army rather than a company trying to make a profit from them.