If you register for the Giant Tiger mailing list online, they will send you a free coupon for a $5 discount on a $15 spend in-store, for use on clothing and footwear.
The coupon is a unique printable coupon, so I cannot share it in here. You'll need to sign up at the above link. The email coupon came within minutes once I had signed up, when I first found this out a few weeks ago. The expiry date on mine stated that it was valid to the 1st of December 2010 , but that may vary depending on your sign-up date.
I had a quick browse through their flyer to see if there were any bargains to spend this on. They actually have some great bargains on kids clothes, which are ideal as the kids grow out of them so fast. For example, they were offering infant PJs for only $4.97, girls PJ pants for $7.97, boys micropolar robes for $12.97, and 4 pairs of girls socks for only $4.