Check out your local library as they often have thousands of ebooks available for download. Plus lots of free ones available from other sources. No problem returning them as they simply expire if you don't. No fines and you can eat and read at the same time without worrying about getting ketchup on the book
I bought my ereader in April as I work in a northern town of 400 people in the summer and have long since read all of the books in it. It is a Sony PRS-600 which is not perfect but good enough and I love the convenience and freedom it gives me.
No frieght for bringing 80 second-hand books with me and no dissapointment if I find I don't like one or have read it before.
If I get a bit tired of a book for whatever reason, maybe just in the mood for something a little lighter, heavier etc. I just go on to another and whenthe mood hits, continue reading the book I dropped right where I left off . No bookmarks, dogeared pages or hunting through a stack of books. Keeps track of where you are in each book no matter how many you have open.
Eink is harder to read than paper for me, but the convenience cannot be beat.