I tried to do some research on incandescent bulbs and the 2007 US Law which supposedly makes them more difficult and/or impossible for US residents to obtain, since my neighbor is another one who's been telling me that it's impossible to buy them.
Very confusing. I could not find what I would call a single source of complete information.
The 100 Watt incandescent bulbs I linked to on Amazon are imported from Hungary.
The ban supposedly went into effect 2 years ago, on Jan 1 2014.
GE supposedly made their last incandescent bulb in the US in 2010, but then they supposedly opened up a factory in Ohio in 2013 where they were making a new kind of more efficient incandescent bulb with a halogen capsule. I say "supposedly" for both of those "facts" because the stories I read were dated, and I didn't find follow-up stories.
So, who knows? All I know is I'm completely happy with LED bulbs. CREE brand are made in the US as far as I can tell, but that might be old news as well and might no longer be true.
Halogen bulbs are incandescent bulbs that don't fall under any prohibition because they're more efficient than tungsten-filament incandescent bulbs.