Not a single wafer, but the sensor built for the Large Synoptic Survey Telescope is a ~64x64cm 3.2-gigapixel CCD, made of 189 4x4cm chips on the same sensor bed[0].

I suspect the cost was in the millions of dollars for the one-of-a-kind sensor, but I bet you could get a great deal on a second one since they've already done the R&D!

[0]https://en.wikipedia.org/wiki/Vera_C._Rubin_Observatory#Came...

The LargeSense LS911 features a single shot 9×11-inch monochrome CMOS sensor with a 75-micron pixel size, a high base sensitivity of ISO 2100, and a maximum sensitivity of ISO 6400.

https://petapixel.com/2018/04/17/largesense-unveils-worlds-f...

This thing only shoots 12mp images (and only in black and white). Nothing like what you'd get from an actual large format film camera.

You can turn any black and white camera into a color camera by taking 3 pictures with a red, green, and blue filter. Obviously only works with a static subject.

I must admit 12MP is lower than I expected. It seems the intent was to use large pixels to get huge tonal range rather than small pixels for resolution.

They might be going for people who shoot and print at 8x10, so 12mp is ~400dpi... "probably" high enough for that. Or maybe the color resolution and response is amazing. Or maybe it's all about the lens you'd use. Not sure exactly what the market is for this, even after perusing their site.

The photographer who created it uses it for some final work, but also for setting up shots and switching to film for the final shot.

That was great, thanks. Still doubt you'll ever see one.

You're right, I definitely won't if it costs $106k. ;)