Good display has a round 1.65" color eink that includes:

Red, Bule, Green, Yellow, Black and White

Hopefully their product QA/QC is better than the marketing side.

The prices are low, with the 7.5" touch display with front light under $50, 10.3" under $150, and the 13.3" under $360. I say "under" because they show a sale price, but the price I note is the full according to the page.

$60 for the rest of the hardware according to free-ink makes these all good options pricewise, plus the cost of a proper case. I'd probably do one out of wood personally, I feel like that would be both fun and look really good.

Overall a cool project, I'm going to have to check it out some more later.