Greenzone have an offer on their 3 speed hub 16" bike at the moment. Looks really nice, 3 colours to choose from. It's $299 but does have some very decent parts and the 3 speed hub will probably go on for ever. Definitely worth considering if you want a bike with longer term reliability. Suspect the frame is pretty much the same factory as the Downtube. Not really a fan of their 20" models though, look to be low end drivetrains but these 3 speed models look very nice.

https://www.greenzonebikes.com/folding-bicycles?path=60