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This eink display[1] from taobao is 7.5" and 800x480 resolution with a price of CNY 375(USD 53.67).

1. https://detail.tmall.com/item.htm?id=611687850885

Also available on ebay for 59.99 along with hardware to connect it to a raspberry pi.

edit: Of course all you get is the display. Paperd comes with a battery, esp32, buttons and so on plus I'm guessing examples of how to code the things.

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