20 amp receptacles cost more than 69 cents. There is one jurisdiction here that makes you use 20 amp duplex receptacles on laundry, microwave or refrigerator circuits where there is only 1 receptacle. I have argued with them MANY times over the years about the fine print note (FPN) mentioned in the NEC. 210.21 (B) (1) {2005 NEC} and pointed out that a duplex receptacle is not a single receptacle by code. After years of arguing, I found it was easier to just use 20A duplex receptacles. Now, I use them on ALL of the 20 amp circuits. That makes me look good compared to other guys! After all, it is the right thing to do!