I have an idea for US Audio Mart and its partner Canuck Audio Mart, why have to separate web addresses or two separate entities, why not have a web developer create one main index page and rename it something like, Audio Mart or North America Audio Mart, to long I know, that way instead of having a division between the two sites for people to enter through, they enter through one site name and then have the option to filter for whats more convenient for them, which is already offered. I think there is more strength in having a more uniformed user experience then breaking it apart by country.
With one main index page there is more potential to focus on heavily used key words by Google and increase SEO which could be used to compete with similar sites. If key words are focused on and used through out the site it will help organically increase the placement or appearance of where Audio Mart comes up when people do searches. This strategy might increase user traffic and get more people to join and use Audio Mart over their other choices.
Just some thoughts to those that make the decisions around here.