Shipping small, flat items

[cats_purr]

I have several small flat items for sale — antique cards/valentines, postcards, stamps, small documents, etc. They generally sell for less than $10. I would like to find a way to ship them from Ebay as first class letters, not packages, which cost too much. If I put a card into a bubble mailer, it is then too thick to be a letter, and postage is a minimum of $4.00. Usually these items don’t qualify for media mail. What to do? 

[tobaccocardyahoo]

If the category allows it you can use Ebay Standard Envelope with a sometimes works tracking method and insurance for a bit more than the cost of a stamp.

It is a special case of First Class Letter Postage

https://www.ebay.com/help/selling/shipping-items/setting-shipping-options/ebay-standard-envelope?id=...

[nobody*s_perfect]

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@cats_purr wrote: .... I would like to find a way to ship them from Ebay as first class letters.... What to do? 

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Some of the categories that you named (postcards, stamps, etc) Are eligible for the special eBay "standard envelope" as described in the other post.   Details here:

https://www.ebay.com/sellercenter/shipping/choosing-a-carrier-and-service/ebay-standard-envelope

For items that are not eligible, just go ahead and mail them as letters.  You can't purchase that postage through eBay, so just put stamps on them.