Office of Trade and Economic Analysis 
http://www.trade.gov/mas/ian/
Click on U.S. Foreign Trade Highlights (left column)
For Totals: Click on U.S. Aggregate Foreign Trade Data

Trade Data Online
http://www.ic.gc.ca/eic/site/tdo-dcd.nsf/eng/Home
Search by Product or by Industry
Scroll down to U.S. Trade statistics.