These are in the order I have found them useful for my studying. For roughly $100 you could have memebership to most them for a 30 day cram session to complement other training. After 30 days you could keep just the one you find most useful. Safari is a great general reference for IT related topics. I utilize the sight on a weekly basis. I was able to get a one year subscription for $199 by signing up for the trial and then letting it expire. Study Notes is my newest addition and I haven’t had enough opportunity to review it, though I am optimistic it could end up in my top 2-3 sites.
Skillshare – Includes 2 free months
cccure – 30 day, $47.77
Safari Books Online – 10 day trial, $39 per month
Cybrary – No charge
Pluralsight – 10 day trial, $35 per month
CISSP Study Notes – Videos and other training, $25 per month