I got both my ibook and mbp from the online store.
RAM I purchased from OWC in the US the small amount of duty was worth the cheap price.
My bro got his powerbook from my universities computer store.
Sometimes educational institutions have good deals on hardware, but if your not a student you'll pay more (if they sell to you, depends on where you go)
As for futureshop/bestbuy etc. they are all about the hp, compaq, toshiba etc sales, half their staff don't even know what a mac is, just that they're different and that you'd be "better off" with a HP running vista... (honestly they will dissuade people simply because they don't know anything about the macs [or have only the base models, 6 months old in stock], I will admit I was there the other day and stepped in to inform one of the people the salesperson was trying to convince to get a 17" compaq instead of the mbp 17, which they didn't have in stock and the saleskid knew nothing about... but anyway) So futureshop etc. are not necessarily the best people as they don't specialize in macs just ipods.
Apple only Resellers are generally good, if you have them in your area, check apple's website for locations.