It seems strange that you have all of the tests except the GR9677.
Anyway, as a clarification to other members, the ETS physics book (isbn=0886851971)
contains the GR9677, GR9277, and GR8677.
The GR9677 used to be able to be downloaded from the ETS site but now you can find it around on places like:http://phys.columbia.edu/~hbar/Physics-GRE.pdf
The new news is that ETS now lets you download the GR0177.
Note: The difficult tests to get are te GR9277 and GR8677 (i.e. the ETS book is difficult to get). I can not get these tests for you so I decided to start a thread: Tips to find "Gre: Practicing to Take the Physics Test"