Best Buy offers the ZAGG Arsenal Case for iPhone 5 and 5S in White, model no. IP5ARS-WH0, for $13.99. Opt for in-store pickup to dodge the $2.99 shipping fee. That's a $46 overnight drop and the lowest total in-stock price we could find by $21. It features a hard outer shell with a soft inner core.
Note, Amazon charges the same with free shipping for Prime members, albeit with a one to two month shipping delay.