Thanks for the "heads up", gregory.
The whys and wherefores of the media mail definition are strange -- but the official post office position on tarot cards is clear: not media mail.
Should they qualify? The ISBN argument doesn't hold, because: 1) not all tarot decks actually do have an ISBN, and 2) the USPS doesn't use the ISBN as a defining feature of their media mail policy. (Plus, I've tried it myself -- it didn't seem to impress anyone at the post office.)
The upshot is: what the USPS says qualifies, qualifies. What they say doesn't qualify, doesn't qualify.
We send deck/book sets by media mail in some cases (although I still prefer Priority Mail for an almost endless list of reasons). We note the item on any declaring forms as a book, not as cards. This may be splitting hairs, but we've never had the USPS complain to us on this point.
A couple of years ago, I had a customer absolutely
insist that I send his order of decks via media mail, despite my repeated advisories that the USPS might not like it. He claimed he had decks sent to him via media mail all the time...
...Two weeks later, I got a politely-worded form letter from the USPS, informing me that the shipment had not qualified for media mail, that the customer had been charged postage due, and that I'd better not consider trying that again.
You can try to ship your decks however you like. The post office may inspect the package and disqualify it at the lower postage rate; they may not. In my experience, with deck-only shipments, you're taking your chances. Amazon and similar sites may get by with it because they're the 900-lb., shipping-revenue gorilla. Furthermore, your typical USPS worker may not even be aware that things like tarots are sold through that venue... so they get an automatic "by", perhaps.
From where I'm at, the USPS provides top-notch service at a price that, even at Priority rates, is lower than I can get from any of the commercial carriers in my area (even with the recent rate increases). Times are tight, and it's in our best interests as a business to keep the shipping costs as low as possible for our customers. But there comes a point where a dollar's (or often even less) difference in cost makes a world of difference in service. As we've never had a domestic package lost through the USPS (nor an international package either, if it was sent using the USPS Priority service), and the delivery time is, nearly without exception, 72 hours or less -- and as our local USPS people are friendly and helpful and have done a LOT to help us with any problems that arise, all without complaint -- I am not going to begrudge them a few extra pennies on the postage. I know USPS service isn't perfect everywhere... but from where I stand, they're worth it.
-- Jeannette
The Tarot Garden