Apple does not repair iPads, but if the screen has been damaged due to accident will replace the entire iPad for a flat fee. If you have AppleCare+ on the iPad, the cost will be relatively minimal; $49 in the US. Otherwise, see the Repair Pricing section here:
There are independent iPad repair services that may be able to replace the screen for less. Do a web search for "ipad repair". You can also look for parts and instructions and do the repair yourself. Note, though, that if you elect to have the iPad serviced by an unauthorized shop or perform your own repair, you will get no further support from Apple.
This is the iPod touch forum, by the way.