I try to save money by collecting coupons, discount offers, etc. whenever I can.
Nowadays, there are these coupons on the receipts in these fastfood restaurants that offer some heavy discounts in exchange for a quick online survey, which must be done quickly (e.g. in 2 days) and must be redeemed in around 30 days or so. The offers are usually valid for 1 time only every 30 days. I believe they use cache in the browser to prevent cheaters, a system that can easily be defeated, though I have yet to try.
Anyhow, I shall keep track of my usage of these coupons here.
01/19/2016 - I've redeemed the survey coupon from Popeye (free 2 pieces, a bread, with purchase of 1 large drink)
01/20/2016 - I've redeemed the survey coupon from Burger King (free whopper burger with purchase of 1 small fries and drink)