Yes, Mrs. Freda, some ebooks are the same or more expensive than the book (some are less expensive).
MR (MobileRead) has many free ebooks for your Sony 505. They have been carefully handcrafted by some very dedicated members to look good on our Readers.
Just click on my blue link to go to the
BBeB (Sony lrf) format ebooks on MR and the
ePub format ebooks right here on MR. They are all free.
Also, you can find free ebooks at
feedbooks.com and
manybooks.net.
Baen.com has a
great free library and lots of Science Fiction for purchase.
Smashwords.com is also a great site for many free and for purchase ebooks.