There are tons of places to buy mead online. But many of them cannot ship to consumers. At least, consumers in certain states. Florida law prohibits alcohol from being shipped other than through the taxed distribution lines. I am not sure of where you are but you might run into that problem. No real need to research it... if you are in a bad state the meadery won't ship to you -- or they might and no one will know. But if you aren't the best you can do is try and get a distributer to order some for you -- not sure if this would work but worth a shot.
Or find someone who lives in a state that does sell it, or that it can be shipped to, ship it to you. Obviously this isn't going to be legal. But when it comes to the law I stopped worrying about them when the number I routinely break surpassed the fingers I have. As long as you keep it out of the public eye you should be safe. Of all the laws I would break or do break I think this one is probably the most justifiable -- since minors purchasing alcohol could happen, UPS drivers can check for IDs but how well could they be regulated? Yes, there are ways around this justification but it makes more sense than some laws... like the law forbidding my poker games when the pot exceeds $10. When you bet quarters and have 6 people the pot will be at $10 well before the end of a hand!
Well, rant mode off. Try some health food stores... oddly enough I found a natural food store near me that carries three different types of mead. I haven't bought any but I will soon.