Not so easy here. For warranty purposes something like
www.etronics.com will result in you having no warranty.
www.6ave.com are Denon authorised retailers but they do not ship to Canada. I do not know what will happen if you have a US product and you need warranty service. Do you want to ship it over the border again with all the hassles of having sales tax issues etc?
For certain things I have no worries at all about buying on the web from US sites but with speakers, receivers etc I really do not want the hassle. I want to have a store close by if I want to upgrade on a whim, or have some problem. Being in Canada creates a lot of problems with cross-border shipping and to me is not worth it, even though US prices are very attractive.
However, forgetting the wonderful 6ave.com price break on the 3803 their price on the 2803 is more (US$799) that I can get from my store in Vancouver Hi-fi Centre when converted. Their 3803 (forgetting about the special deal) price is a bit cheaper but not that cheap enough that I can forget about the demerits.
And from my store I can get trade-ins down the road which the mass market stores will not give you. On my 3 year old Pioneer VSX-509s I received a C$200 trade-in which I thought was fair.
Peter