On Saturday, December 18, 2010, I went to Toyota Walton Motors Lahore for 10,000 km maintenance of my GLi. They installed the ECU cover for Rs. 500.
So Lahore members, if you don't get this cover from market then you can get it from Toyota Walton Motors for Rs. 500.
I don't know if this cover is available at other Toyota dealers or not. Today I went to Toyota Cantt Motors for 1000 Km free checkup of my uncle's XLi and they didn't asked to install that cover.
I hope this will help.