We have semi Amazon ransacked for a suitable, inexpensive (not cheap) Cover. So we have arrived at the "i-tecfox iPhone 4 & 4S Premium Gel Cover". At first glance, the cover makes a good impression. The iPhone 4S is a perfect fit and the extension of the volume keys is also managed. The cover is very durable and feels good.
Conclusion: great, durable cover I would buy me back.