wow the markup on the larger E-ink displays is crazy and the price curve is well above the bare added area. looking at the smaller displays it seems to me like prices have even gone up especially for the 7.5" ones and that's surprising considering reTerminal and clones being about 75EUR-ish.

That said there are some displays for the adventurous with no clear ready made interface boards that would need some effort to connect to. Like the ES120MC1 12" high res ones for 50ish USD with some gnarly zif sockets.