According to my calculations this expires at 8:30am EST Friday, so get in quick!
What I love about these invisiblehields is that if you need a new one (iPhone replaced under warranty etc), they will send you a new invisibleshield for free and you just need to return to them what remains of your old one.
The most popular smartphones (iPhone 4/4S, GSIII, GSII, Nexus etc) work out to be $27.60 USD including shipping for the Full Body invisibleSHIELD.
Even with 50% its about 35$ shipped for full body cover.
For the warranty, you have to pay shipping for on the way to them for your old one (~$3 for untracked) and on the way back. (~$20 cheapest). Still paying ~$23 extra for an "under-warranty" replacement.