We are aware of this issue. If you continue getting an error message during check-out that the zip-code you've entered is incorrect, this is what we recommend:
1) Click on the user icon in the top right.
2) Click on "My Account".
3) Look for the section that says "My Saved Cards"
4) If you have any saved cards, click on the trash icon to delete them.
Note: Some of the failed charges may appear on your statement as pending charges temporarily, but they should drop off shortly after.
5) Re-enter your card information and billing address manually during the checkout process and complete the order.