We are all other users, so we don't know any more than you do - I have not seen anything from Apple about watches being available or not. I'd start a chat while you're on the online Apple store and ask them - they may be out of stock and/or foreign shipments aren't coming in?
Edit:
I just tried and picked a watch at random; I had no trouble putting it in my cart; however, I obviously did not want to place an order, so I did not take it any further. So, I'd think it best for you to chat with Apple store personnel.