There is absolutely no harm in checking the items in multiple shops and then buy from where you feel comfortable with
be it price wise
be it support / warranty wise
be it local copy wise
be it customer service wise
be it freebies wise.
The bottom line is, you must feel comfortable.
There is one shop in Farrer Park, which sell HP at a very cheap rate. I came to know this shop from one of my Indian friend.
That shop sells some popular cameras (like 550D, 7D), and probably that may be the cheapest. No idea about warranty status or local copy or not.
Just a note, that shop is very crowded and no try. Just pay and get the item.
For camera, I am from the traditional group... I would like to go to MS, OP or CP only. Just bcoz I feel comfortable with them.... no matter whether $10-20 expensive
Important is, do your homework and be 200% CERTAIN about the model you want to buy. Shop is not the ideal place to decide... high probability that you will be conned by the sales man. My shop loyal friends will differ with me but you never know!!!