These are all brand new (might be a little dusty), and although they are older editions, they are still quite useful.
The prices I put were ones I had from before, so we can discuss them.
Modern Physics 3rd edition (Tipler & Llewellyn) $15
Student Solutions Manual for Modern Physics 3rd edition (Llewellyn) Computer Organization & Design: The Hardware / Software Interface (Patterson & Hennessy) $5
Operating System Concepts 5th Edition (Silberschatz & Galvin) $15
Assembly Language for Intel-Based Computers 3rd Edition (Irvine) w/Free Microsoft MASM 6.11 Assembler CD (unopened) $15