This has happened to me.

When it has, I've explained to the seller that since no amount was listed they should send it using the same rule of thumb that other sellers use when mailing a chip. I explain about the bubble mailer and indicate that the avarage charge should be no more than $1-1.50 based on how the chip is enclosed in the envelope.

I've never had anyone give me a hard time about it. Some people sell the occasional chip and have no idea how to mail it. They base their shipping charge the type of merchandise they usually sell (not chips). They haven't got a clue about using the bubble mailers.

They are usually amazed at this option.

I would check the other things that the seller is selling and see if this is true.

Good Luck!