If you pay a local repair shop to replace the LCD, expect to pay $175-$325 depending on the model of the laptop. (the screens typically cost $75-$200, and labor is usually around $100-$125). Do you know the model of the laptop? If you do, I can give you a better idea of the costs involved.
And if this is a desktop LCD monitor, just go buy a new one. The costs involved with replacing a cracked desktop LCD versus the cost of just going and buying a new one don't justify replacing a broken LCD in a desktop monitor.