Unfortunately, they tend to be quite pricey and small, and I can't find pricing on this anywhere.
They’ve got a nice 12.5” display (1304x984) @ $170, which is pricey but big enough for league tables.
Based on my own experience (I have one) I can say it has a high enough refresh rate, and little ghosting (none is impossible as costs too much battery to do full refresh).
Also, the UPS Lite, also from China (AliExpress or whatever), is excellent.
Do keep in mind this is a specific/different project, with a much smaller screen, meant to be portable (for on the go).
Paperd.Ink has a refresh rate of 4s for full refresh and <1s for partial. We're working on lowering it further.
IIRC someone figured how to expedite it but that someone had to.
I am not affiliated with that company in any way.
Edit: just found out this project.
The version of the e-reader is important if you want to access deep sleep / RTC for lower power usage.
Thanks for the info, will definitely check it out. You can fill in our form if you'd like.