For smaller displays than you're looking for (<4 inch), AliExpress has some pretty reasonable prices. Even for color displays. For larger ones, I think the bes

For smaller displays than you're looking for (<4 inch), AliExpress has some pretty reasonable prices. Even for color displays. For larger ones, I think the best option is something like a recycled kindle. There was even a post on HN a few months ago from a company selling Kindle displays hooked up to breakout boards (may have even had on-onboard microcontroller, like an ESP-32?)