Orbitz.com
kayak.com
If you are willing to drive to Buffalo, NY and fly from there, you may save money, and in that case also check Southwest.com
You may also consider arriving in Oakland, CA or San Francisco, CA, since they are very close to San Jose, if you can find considerably cheaper flights to those places.
Ive used selloffairlines.com before they have pretty good last minute rates from t.o
try this site
“VR3 Travel”