They are still available. I got ours at the Mexico pavilion last month and I’m pretty sure they are available in the shops of each county as well. It was 13.99.
The free version was a ziploc bag that looks like a suitcase and then they are giving postcards and stickers at each country. The front of the postcard has the country’s flag on it and a spot for them to write something and the back is a pic for kids to color. My oldest had the passport and also did the free version. My younger kids just did the free version.