My patience paid off today. I've been waiting a couple months to buy toner for my laser printer. It's expensive toner, and never seems to come on sale, but it does last forever when I buy it.
This week I received a direct mail piece from Amex with an offer of $25 gift card when you use your Amex card at London Drugs on a $75 purchase. Picked up one toner for $74.99 (and a 0.99 pack of gum to get over $75) and used the free $25 gift card on the second toner making it $50.