The post office has changed their fee structure over the past few years (with zones, first-class parcel vs first-class letter, etc,...), so I think the cheapest it costs to send a bubble mailer package is $2.25 (I may be wrong, though)
I agree that $5 is a little high on postage, but it's actual great that he used the extra services. Why should you care if he over spent on those services for you to get the card ? I would love a seller to do that. I've received a card loose in an envelope on occasion.
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