See also old Sony PRS350 for a 5″. Much smaller with same screen. Collections work with calibre.
And various versions of the P47L, a 4.7″ elongated eink. Available from Denmark, China, Amazon. New and €70 to €100 including shipping. Mine (from Denmark) had 8G storage rather than 2G. Amazon Germany currently under €70.
https://www.mobileread.com/forums/sh...93#post4361493
No Collections or Series, but very easy to use and bright despite having no touch or frontlight.