ZAGG cuts 20% off all regular-priced invisibleSHIELD purchases via coupon code "ZAGG20". That's tied with our mention from three weeks ago as the best percent-off deal we've seen on these items since May, when ZAGG took 50% off sitewide. Shipping starts at $2.99, or spend over $29.98 for free shipping. ZAGG invisibleSHIELDs are clear plastic protectors custom-designed for various phones, cameras, MP3 players, GPS devices, laptops, and more.