Encrypt your shipping details to the vendor's PGP key before you paste them into the order. That way the details are readable only by the vendor, not by anyone who later gains access to the market database.
Take the vendor's public key from their profile, encrypt your address to it with GnuPG, and paste the encrypted block into the order. It is a two-minute habit that closes a permanent risk. Some markets encrypt by default, but doing it yourself guarantees it.
Never send a plain-text address if you can encrypt it.