Nope, I was there in September and no bargains to be had, at least at window prices. I didn't go in and haggle, and like everything else in Istanbul, maybe haggling can get you a good deal. (As in, "Ten for that? You must be mad!" etc etc.)
There is an area full of electronics/camera shops in the area of the old town behind the spice bazaar and new mosque. Worth a wander around, but I doubt serious bargaining can be had without speaking the language.
It's a great city though, very photogenic. Enjoy.