Battery is an issue for older Sony models. I am geek enough not to qualify as an average user, but my attempt to replace (weak, but still working) battery on prs505 led to instant upgrade to my Kobo touch
Anyway, for Canadians who are looking for deals on refurbs, I believe that it is difficult to beat Factory Direct prices:
http://www.factorydirect.ca/Categori...aders/Ereaders