Good Source for Garmin BlueCharts?

[Latitude9.5]

Just wondering if anyone knows of a good site for garmin bluecharts, i picked up an Explorer Chartbook and noticed the garmin chip now contains the explorer charts, figured I pick up the digital version as well.

I shopped around a bit, $170 seems to be the going rate, but as you probably know some of this stuff you order off the web takes months to get here. I am usually a fan of supporting my local merchant, but they want $235 at the local store, with something as simple as a chart chip i figured i find an online source. My new garmin has all of the "US Waters" preloaded, but no bahamas.

thanks!