They are cheap because when flat TVs became affordable, everyone in the world wanted to replace their CRT TV. That created a one time demand for a billion or more flat TVs. Now that demand has been satisfied, and most people who have a CRT have one because they like to play retro games on it. However, South Korea and China still have the production capacity they built for that one time replacement wave. I have a C8 (2018) and a 1080P LCD set from around 2011. Both work fine. The C5 is now cheaper than the C8 was. No particular reason to replace either one of them. The C5 might be brighter but the C8 still looks fine in a dark room. There is no used resale market for TVs because new cheap TVs look better than most old expensive TVs. The market is saturated.

Does anyone have a good source for the international version in the USA? I have a P9 now and if it got run over by a bus, I'd be looking for the physical SIM version of the 10P.

Pixel Tablet works for me. It's a couple generations old hardware wise, but the screen is fine, the battery lasts a while, and it will do all the things you mention. Watch for deals.