PC Micro Store cuts an extra 50% off a selection of rooCASE Cases and Screen Protectors for Samsung Galaxy S4 via coupon code "SAMS540APR". Plus, all orders qualify for free shipping. Coupon expires after 500 uses.
A best bet is the rooCASE Bumper Case for Samsung Galaxy S4 in Black/Grey (pictured) for $10.95 before the above coupon, $5.47 after. With free shipping, that's the lowest total price we could find by $18. It's made from flexible TPU material.
These products are the ingredients for a stable financial life so you can weather whatever comes your way.