I don't like any of these names. You can get away from using books in the name if you come up with a memorable and short adjective or verb that encapsulates th

I don't like any of these names. You can get away from using books in the name if you come up with a memorable and short adjective or verb that encapsulates the service and "textbooks" can be used in the tagline subtitle. And "bookpenguin" is likely to generate a C&D order from Penguin Books.