Hello,
If you want to do it by yourself, you can follow the folliwng steps:

1. Buy the screen from Qatar or E-bay, I saw lot of them in E-bay.
2.Follow this website to see how to remove the old screen and to install the new one.
http://www.irisvista.com/tech/laptops/ToshibaM55/laptop_LCD_screen_remov...

I never replaced a broken screen, but once installed a keyboard. I found the experience, not too difficult. Hopefully it will help.

Cheers