I know eBay has “eBay envelope” for like certain collectibles but that’s limited by category (that service also has never worked for me), so perhaps this seller just has a custom shipping rule that is that low? But they would lose money on a sale like this. I suppose the hope could be that people buy multiple items at once if they have plenty of (in this case) retro games
Edited - added screen shot of low end rate costs for ground advantage and media mail


Depends where you are but for us if it fits in a 6x9 envelope and is thinner that a certain height ( I forget 5/8" maybe. Then it ships for a couple of dollars. As soon as thickness goes over that limit is becomes like $20
What service is that? Cant be ground advantage which starts at 4.50
If it’s non machinable (rigid) then it has to go ground advantage, etc.
Im in Canada, so 6x9 under 50g is $1.75 I think. Higher rate for heavier.
Wow what an amazing deal, sucks to be in the us i guess
Yeah my sister sent me a thin spring jacket across country, in one of those envelopes before. Cost her $2. But as soon as you exceed what they determine is a letter slots thickness, it jumps to $20+ bcause now they can’t drop it through a mail slot and needs an actual delivery