Considering an executive membership is already $130 per year (plus taxes), this is a pretty sweet deal and includes a free household card. You can redeem your gold star online voucher using the same steps as for the executive membership. The limited-time offer runs until Dec. 21, and all you have to do is bring a friend to any Costco membership counter in Canada. Once your friend signs up for a new Costco membership, present the offer page to the membership clerk, and you'll both receive the vouchers. You'll receive the online voucher through your email within two to four business days of completing the enrollment process.