Is it possible to add/link MarketPress with Canada Post Shipping information to help shop merchants?

I have a GridMarket MarketPress multisite. Is it possible to add/link Canada Post Shipping into MarketPress, to help our shop merchants determine proper shipping costs per item? The simpler and more up to date their information the better!

Is it possible to link to Canada Post and their online shipping services? They have much better services now, and possibly would have functions to link to eCommerce sites.