You can sell your antique glass power line insulators at your local flee markets, on e-bay, or post them on craig's list. All would be good. If you do e-bay or craig's list, adding a picture would be good. You can set your price, or not take less than a certain amount. Craig's list is free.

Before you sell them, I would suggest doing a little research on what you have first. I have bought and sold several of these on e-bay and have come to discover that some are more valuable than others. Depending on the glass color, the stamps and the shape, they can vary in value from really cheap to crazy expensive.