If you need to send money digitally without visiting a physical location, consider these online-only services: Sending Money Orders - USPS
Since you can't buy them online, here is the standard process for getting one at the Post Office:
: Use the USPS Locator to find your nearest office. buy postal money order online
You cannot buy a physical USPS postal money order online. You must purchase them in person at a Post Office location using cash or a debit card. How to Get a Money Order
: You can buy domestic money orders for any amount up to $1,000. If you need to send money digitally without
: Bring cash or a debit card; credit cards and personal checks are not accepted.
: This is your only proof of purchase and is required to track or replace a lost order. Online Alternatives How to Get a Money Order : You
: Write the recipient's name immediately to prevent anyone else from cashing it if it's lost.