The LRC has long focused on purchasing books related to bioethics. This is merely a sampling of the most recent, most popular, and most interesting books on bioethics out there. Several of them may be mentioned in your bioethics class.
If you have a particular interest in bioethics, you may also wish to search the library catalog for books on topics like:
No way out
Out of the Ashes
Pills, profits, protest : a chronicle of the global AIDS movement
Demon doctors : physicians as serial killers