What is the most cost effective packaging for shipping WST?

Hi,
I am going to list all of my World's Smallest Transformers (WST) for sale next week on eBay. I have almost the complete set.
The question I have, though, is what is the most cost effective packaging I should use to ship them? As you know, the boxes are REALLY tiny. Is it adequate to simply use a padded envelope? If so, what kind should I buy?
If a padded envelope will not work, is there a type of inexpensive box I could buy?
I do not believe I am breaking protocol by listing this question here, as this is in the context of selling my WST figures. I will probably have them listed by next weekend. As you know, it takes a little while to photograph everything and place listings on eBay.
Thanks!
-NM
I am going to list all of my World's Smallest Transformers (WST) for sale next week on eBay. I have almost the complete set.
The question I have, though, is what is the most cost effective packaging I should use to ship them? As you know, the boxes are REALLY tiny. Is it adequate to simply use a padded envelope? If so, what kind should I buy?
If a padded envelope will not work, is there a type of inexpensive box I could buy?
I do not believe I am breaking protocol by listing this question here, as this is in the context of selling my WST figures. I will probably have them listed by next weekend. As you know, it takes a little while to photograph everything and place listings on eBay.
Thanks!
-NM