Are there any commonly available and supported backlit, monochrome graphic LCDs with more than 128x64 pixels?
Here you can find a bunch of displays at new haven display, which are big and OLED and not too expensive:


2.7" 128x64 OLED
3.12" 256x64 OLED


Those OLED Displays have a really excellent viewing angle and can be read from far (given you accept those sizes, which are >2").

Otherwise, the biggest I know about are LCD ones from NHD over there:


320x240 LCD with backlight


What's good with them, it's that they can cope with production in case this is needed, their prices are decent and their product just work(cTMr). You can find the u8g library to run them.