The expiration is just to get the credits.
I ended up just getting everything in the Featured Page (I had 10 already, some from that page) and that took me up to 95, and then I just grabbed 5 more at random.
I have $27 left over for the store. Probably just going to wait until the day before it expires to use it. Bought Stephen King's On Writing and Choosing A Jewish Life (No, not by Stephen King
). Also Stephen Colbert's I Am America (And So Can You), which was a steal at $10.XX... most other places have it at $17.XX.
Now I have tons of books to read !
Edit: I went over the credits but got some books I've been wanting to read. Picked up the following for ~$10 at the store after $50 credit:
Choosing A Jewish Life
On Writing
I Am America (And So Can You)
A Short History Of Nearly Everything
Einstein
The Nine
The Best Book Of Useless Information
The pricing is really not expensive. I can see a new addiction forming
