Help...To replace laptop screen

Hi folks...i had earlier asked for help regarding my laptops battery but unfortunately couldnt get any replies. This time my screen is on the verge of dying and i need a replacement screen.
I'll replace the screen only if its reasonably priced.So i wanted to know how much would a branded 15.4inch wxga screen cost to replace.please guys i need to know the price quickly because if its too costly i'll buy a netbook instead...
The laptop is toshiba a100 709...
thank you...