It is now possible to buy a "Cartão Navegante" on the Lisbon Metro website, without leaving home, and pick it up at a station of your choice the next day.

In the near future, you won't need a physical Navegante card to charge your pass or to occasionally use public transportation in the Lisbon metropolitan area. And in Navigator portal (the replacement for VIVA Portal) it will be possible to manage our digital passenger account. But while this long-awaited dematerialization of ticketing is not happening, the Metro de Lisboa offers a way to buy the Navegante card without leaving home.
Through Metro's website, it is now possible to request a "Cartão Navegante" ("the tough ones") so you can use any of the public transportation in the entire Lisbon metropolitan area (amL). On that card, you can load the monthly pass, you can load balance zapping to, for example, pay for cheaper trips on Carris Metropolitana, and you can also use that card to access the small bike rack network in Lisbon and Setúbal.
You can buy a Navigator Card on the Metro website, you just need to go to this page and choose whether you want the card in one business day (the usual €12) or in 10 business days (it's €6). Then just download, fill out and submit a form, along with a photo of yourself (which you can do with your cell phone) and a copy of your Citizen's Card (you can send a scan of the card with your cell phone or use the official app id.gov.pt). Finally, you have to make the payment and wait for an e-mail indicating that your Navegante Card is ready - you will be able to pick it up at a Metro station of your choice.

According to a communiqué issued by Metro de Lisboa, this The new customer service channel intends to contribute to the reduction of queues, as part of the objectives defined by Metropolitano de Lisboa to increase the production capacity of the "Cartão Navegante", reducing waiting times and thus providing a faster and more effective service. This initiative also aims to contribute to the dematerialization and digitalization of administrative processes, as well as to the reduction of paper consumption and consequent reduction of the environmental impact associated with the company's activity"..
As an alternative to this process, you can buy a Navigator Card in a few minutes in any Navigator Point machine or in person at a Navigator Space. Here you only need to take your Citizen's Card (and in the case of the Navegante Points also a bank card); the Navegante Card is printed on the spot for 12 euros.