Note, be sure to download the app first then make the In-App Full Version purchase for $0.99. Must be logged into your Google Account w/ a qualifying device in order to take advantage of this offer.
Editor's Notes & Price Research
Solid Explorer is an easy file and cloud manager with two independent panels. Includes various support including Dropbox, Box, Google Drive, OneDrive, Mega and Owncloud. You may also connect to your PC or work w/ remote service using FTP, SFTP, or WebDav. File extensions such as ZIP, RAR and 7ZIP are also compatible. For more information on this app, please visit the developers site. - Discombobulated
In App Purchase for Full Version is 50% off ($1.99 orig).
Previous FP Deal (310 upvotes): http://slickdeals.net/f/8396349-solid-explorer-file-manager-google-playstore-0-99