Can I buy from Puerto Rico?

So I got told here a few weeks ago from a moderator that I could buy/sell physical items from Puerto Rico. I’ve sold items successfully like games, 3ds, etc. But I wanted to buy something physical for the first time. So I went ahead and put my address but when I selected my country, Puerto Rico, The app said US addresses only for physical items (something like that). What now?

Can I please get an answer?