Student membership starts at $9.95 per month I believe. I pay $20 per month, but I have the cardiology section as well (which they are doing away with).
Some schools offer it free of charge, but you may have trouble accessing it. My school only has 3 licenses, so it sucks when you absolutely need to access it right away and there are 3 users already logged on (or some idiot forgot to log off after finishing their session). Hence the reason I subscribed myself.