Support for Master's students really depends on the school. UCSD, where the author works, provides good support for Master's students. I have a friend who is attending UCSD for a Master's (albeit in Civil Engineering) who has received a TA position that covers his in-state tuition (but has to pay out-of-state fees), and pays a stipend.
Almost all the graduate schools I have researched have explicitly stated whether or not they offer any support to Master's students.
Afaik, finding support for CS students is not hard in many schools. Many other departments recruit RAs from the CS dept to help with their research. e.g. I had a RA with Arid lands research program 3 out of 4 semesters during my Master's. Though this will probably vary from uni to uni and this info can be found by getting in touch with some Master students in the dept.
Also, I had a TA in my last semester. So, its a YMMV for RAs/TAs depending on the university.
Almost all the graduate schools I have researched have explicitly stated whether or not they offer any support to Master's students.