Heights Mobile via eBay offers the OtterBox Defender Hybrid Case with Holster for iPhone 4 and 4S in Black (pictured), Purple, or Pink/Black, model no. APL2-I4SUN-20-E4OTR_A, for $26.49 with free shipping. That's the lowest total price we could find by $5. It features a clear protective membrane for the touchscreen and three layers of protection.