hi all
please introduce me a e-book reader device with this specifications:
1.It has a large screen as possible as
2.I want just read pdf with it not anything else like mp4 playing and other
3.os of device is not important for me (Linux or Windows) but for price of device with Windows i prefer Linux os
4.its comminucation section only USB is enough for me
4.its memory can be extendede with external flash card
5.its price bitween 0<$<100
