I was looking for something as well. Got a charger with J1772 connector through electric company to get off peak rates. I was sure the adapter would be misplaced since it would be going on and off the charger daily.
I ended up using a french fry holder. Hang that on the wall and throw the adapter in there. Really stupid, but it works. Have not misplaced it in almost two years.
I found one at a local store for a couple dollars, but Amazon has them as well.