Here are some that are on the market:
Pangea Audio Premier AC Outlet - $29.00
PS Audio Power Port Classic AC Receptacle - $49.00
Cardas Duplex Power Outlet - $135.00
Wattgate 381 AU TR Audio Grade Receptacle - $148.00
AudioQuest NRG Edison 20 - $179.00
Furutech GTX-D (G) Duplex Copper Receptacle - $215.00
Furutech GTX-D NCF(R) AC Receptacle - $270.00
Pangea Audio Premier AC Outlet - $29.00
PS Audio Power Port Classic AC Receptacle - $49.00
Cardas Duplex Power Outlet - $135.00
Wattgate 381 AU TR Audio Grade Receptacle - $148.00
AudioQuest NRG Edison 20 - $179.00
Furutech GTX-D (G) Duplex Copper Receptacle - $215.00
Furutech GTX-D NCF(R) AC Receptacle - $270.00