https://www.ebay.com/itm/2-NEW-IFROGZ-REAL-WOOD-PHONE-COVER-CASE-CACHE-FOR-GALAXY-S4-ZAGG/282651059212 This one is made of wood. It may or may not be grippable, 'tho. https://www.ebay.com/itm/Ballistic-Samsung-Galaxy-S4-MAXX-Series-Case-with-Holster-SX1159-A065-Black/171955167418 This one is made of plastic and rubber, but is rugged and grippable. https://www.ebay.com/itm/New-Otterbox-Commuter-Series-Case-For-Samsung-Galaxy-S4/283217517120 This one is also rugged and will likely last a while. The Samsung Galaxy S4 is pretty old, so I couldn't really find any non-eBay sites which sell cases.