The Gap coupon codes have been working online so while this Old Navy one says it is only valid in the U.S., give it a try!!
ONSAVE20 should save you 20% on a purchase of $100 or more. *Excludes Everyday Steals, Leather Outerwear and Baby Merchandise.
It is also Baby Days right now at Old Navy and you can save 30% off everything. PLUS print this coupon and take it instore and save an extra 30% off any one baby item.