My Vapor Store has them in stock.You might want to check your house voltage with a multimeter.We had a problem with that recently and the voltage from the transformer for two houses was going bad and the voltage was going up gradually.No obvious problems at first then the appliances started going one after another.The air conditioner guy caught the problem(august in florida with no air)and called the power company.Anyway,there are several 510 chargers that use a wall to usb adapter,these are more plentiful stateside and can be found at a lot of suppliers.Good Prophets has the adapter and look for the charger that is not the rectangle.If you are good with electrical work,the solder joints in the chinese wall chargers are the weak point and can be redone.
Hope this helped.