+1 to not sure why you would even pay 2000 AM for a baggage tag (or 2) in first place.

Regardless - both prior to the website refresh and in the current interface, it clearly has 2 separate links: The latter, if you're only requesting 1 set (2 tags), it's free.
The $20 USD / 2000 AM only kick in when you try to order 2 or more sets.