I want to buy a Canon Rebel xTi and want to which of the two places is the best to make such purchases – Sunnyvale or Chicago? What would be current price of Rebel xTi in either of the two places?

If you want to purchase it in person the best place to go in chicago is calumet photo, they are experts in photography and you won’t get the dumb teenagers like you would a ritz or a wolf camera. Price for the Xti with the kit lens is 729.99, but if I were you i would just get the body. And get a much better lens.