Amazon has them as well as some online cable specialty companies. I've found them very useful in older UK/EU accommodations where the single electrical outlet in the room is generally located in the most inconvenient place in the room--under the bed, behind the dresser, etc. Instead of a direct plug charger, which can be hard to keep in the socket and requires that my device be left in that location, I can plug in and put the charger on top of a night stand or desk or dresser. I could use an adapter, but I've found the figure 8 cords with the right plug at the end are the best solution for me.