You can usually order a case when you order a Pi, or there are other case makers who offer unique and very cool cases, just take a look in the Ye olde Pi shoppe section for details...
Just so that you are aware. It is only the complete circuit board at this time. You need to buy everything else. Case, power supply & cord, keyboard, mouse, monitor/television, SD card(s). Assuming you own a television you can have a fully functioning system for under $100.00!