I'm not a rich person, so I can't afford high priced e-ink reader, but I need one to read lecture notes which are in pdf format, so, it's ok it has even a 10 sec refresh delay, I just need it to be bigger in screen size, bigger the better (other wise I will have to waste a lot of time zooming in, reposition etc) and also more whitish background. refurbished or used one also ok. China should be making very low cost replicas, replicas also ok with me, I just want to read it without eye strain. I don't need any features, just display a pdf page by page is the only requirement for me. I have a touch screen phone which can read PDFs but the display is 2.5x4 inches, so it's not adequate at all and it can't read many pages without getting eyes hurt. I'm from Sri Lanka. please suggest me few with sizes, prices, buying locations. Many Thanks.