Dun think it would be cheaper to buy at computer fair. Most prob it would be blunded with alot of useless stuff to make it look attractive.
Which includes cleaning kit, umbrella, normal speed media cards, camera bags, mini-tripod.
Anyway, from what i observe for Canon. They will start to bundle their cameras with goodies after a while of its official launch at the price of the initial kit package w/o goodies.
In additional, shops have to pay money to rent a space during computer fair. They can't be selling stuff at a heavily discount price, would not be able justify for the money spent on the rent of the booth.