For the next three months whenever you buy certain Lowrance, Raymarine and Humminbird plotters (you know, the ones us regular anglers use), you can get Navionics+ for $99. That's More than half off for some of the best and most-inclusive charts on the market today. One-foot contours, one year of free updates, a coverage area that includes the United States and Canada (lakes, inshore, nearshore and offshore). It's just a matter of buying the Navionics+ card at the same time you buy the plotter.
Here is the link for the details: http://www.navionics.com/navionics-bundles-save-100
Please let me know if you have any questions. I have Navionics+ on my Raymarine and I love it.