The Galaxy Z Fold2 remains available in the US, contrary to reports. Samsung has not stopped selling it on its US website. However, no US carriers have stock of Samsung's foldable smartphone in either colour, possibly in anticipation of the Galaxy Z Fold 3. Currently, the only way to get your hands on a Galaxy Z Fold2 in the US is to purchase an unlocked handset.
https://www.notebookcheck.net/Samsung-has-not-stopped-selling-the-Galaxy-Z-Fold2-in-the-US-but-carriers-have.546081.0.html
As an owner of both Fold 1 and Fold 2, I'm repeatedly astonished how Samsung can create such a marvel of technology that rivals the Moon landings in its impressiveness... yet cannot seem to get things like reservations and store pages working at all. It's like they're jealous of Sony's botched handling of product distribution and wanted to see what it felt like to fail at it too. :)