Welcome to MR, Zina
There are lots of devices out there and even more going to be announced at CES in a couple of days.
A place to check is the MR
E-book Reader Matrix. Plus, of course, all the forum threads to see what is being said.
Have you checked out
Calibre for doing format conversions? That way you could convert the format to one you could use on a different Reader. Calibre has its own
forum on MR and Kovid (Creator of Calibre) participates.
Just ask if you want to know something and a friendly forum member will answer or point you in the right direction.
Have fun on the forums.