Looking for this in 20A. -- 15A is easy to find.
20A receptacle, where the 3 prong side has a choice of vertical and horizontal slot is very much desired.
Thank you.
You can get a 20 amp outlet, single or duplex, at any big box home center. It will take both 15 amp plugs with parallel spades and 20 amp plugs with one spade turned 90 degrees to the other. These plugs do not twist lock. They come in individual boxes and sell for about $4-5 each.
20 amp twist lock is too large to fit in the opening of the cover plate of a standard duplex receptacle, thus, as Norcal has said, its not made. 15 amp is commonly made in duplex, we use them all over at work, but not 20 amp.