Best packaging material for phone chargers

Hey, I will be selling phone chargers shortly on ebay, Brand new to the process of ebay selling. Was wondering what is the standard type/kind of pakaging for this type of item?
Also if you know of any websites that supply them that would be great(I am in the U.K.)

buy some kraft bubble envelope, it cost 6 cent about on ebay. or 500 for $33 dollars.

or order some for free from usps.com (only 10 limit)