It takes just one accidental drop to kill an iPad or smartphone.
And unfortunately, if the glass cracks, they are difficult or even impossible to repair. To prevent this from happening you want to protect your device with a good case. But there are cases and there are cases. Pretty but flimsy plastic cases will do little to protect your device if you drop it. You need to invest in a good case.
I really like OtterBox cases. Otterbox makes cases for iPhones and iPads, as well as Samsung, Motorola, LG, HTC, Nokia and even BlackBerry phones. They have several lines of cases that offer various levels of protection. They are very well designed and are super-reasonable in price, often the same or only slightly more than many of the junk cases out there. While some OtterBox cases have a screen protector that is integrated in the case, many also come with a standard stick-on screen protector.
For general use I like the cases in the Commuter line. They are reasonable sized and give you 2 levels of protection, a hard outer shell and a silicon liner to absorb an impact. The Preserver series will keep your device dry. The Resurgence line includes a 2,000 mAh lithium ion battery. The Defender series is big and clunky, but will protect your device from just about anything. There are other series as well, and they also make dry boxes.
You can and they are available at many retail stores.