Addon: Gallery Plugin:

Hi,

Thanks for contacting us here about this extension.

$59 with the Addon: Gallery Plugin. I don't understand what the Addon: Gallery Plugin is and cannot find any good info on your website.

You can go here for more information about Gallery Addon: https://www.joomunited.com/wordpress-products/wp-media-folder/wp-media-folder-gallery-addon

What am I NOT getting with the $39 price?

The $39 just includes WP Media folder.
The $59 package includes the plugin, Cloud Addon and Gallery Addon. You can see the comparison here:
https://www.joomunited.com/wordpress-products/wp-media-folder#prices

Hope it helps!
Cheers,