I just signed up for The Source ENews and received an email with the following:

Take $5 off your next purchase of $50 or more at thesource.ca.
Enter coupon code TS839 at checkout
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Excludes Laptop & Desktop computers, televisions, video game hardware & software, cameras and camcorders, cellular phones and plans, MP3 Hardware & iPods, Gift Cards and Prepaid Airtime Cards.