ITPRO50
Got this in my email over the weekend, 50% off coupons come up fairly regularly. The discount lasts for the life of your subscription so not a bad saving if you maximise your use of their services.
I've only checked out their free videos and they seem entertaining and engaging, I'll be twisting my employers arm to see if they'll spot me a subscription with this coupon.
For reference Premium includes unlimited Kaplan IT practice tests and virtual labs - can't speak to the value of these services though.