Is there a grounded duckhead US plug available?
I have a MacBook Pro A1278 with a 60W MagSafe Power Adapter A1344. I prefer using the grounded plug because then I don't feel the electricity on the aluminum computer shell. However, when I travel, I don't like taking the long grounded extension with me. I am wondering if there is a grounded connecter available that plugs directly into the adapter? A quick Google search indicates that these are available in the UK (see pictures below) but I would like the US version. Thanks in advance.
MacBook Pro (13-inch Mid 2012), macOS Sierra (10.12.3)