Unfortunately, I do not have a positive answer for you, as my experience indicates that they are no longer being exported to the US at all.
I was searching for a source to buy them online, and a blog post:
...referenced amigofoods.com, as an online source. Yet when you go to the page to buy Havanna alfajores:
"Unfortunately, the manufacturers of Havanna alfajores
are no longer exporting to the United States. If they begin
to do so, we'll be sure to carry them.
In the mean time, we've got plenty of other imported
alfajores from Argentina to choose from."
All I have to say to that is, "whatever!" No other alfajores stack up to the ones made by Havanna. Don't be fooled into buying anything else.
Recently here in Mexico, we had them at Superama for a special promotion of Argentine products. In typical Mexican fashion, once they sold what they had, they didn't restock them. However, it is important to note that they were specially packaged in vacuum-sealed bags for export to other countries. This would seem to indicate that the manufacturers of Havanna alfajores are again exporting them.
We also have a Havanna store in Mexico City, but it's expensive to fly there from Guadalajara just to pick up a few boxes of alfajores. :(
If you happen to be in Mexico City, you can pick them up at Presidente Masaryk 76
Polanco,. They are open daily from 7:30am to 11:30pm.