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There is nothing to buy yet.

You clicked a real button on a page that is not real yet. That is on the page, not on you.

USN Diving Master exists. The 965 cards are written, the fourteen drills are written, the gate is green, and the deck builds. What does not exist is any of the commerce around it: no payment processor, no delivery, no license file, and no decision from its author that it should be sold at all.

The prices you saw, $49 and $129, were picked by the person who wrote that page so there would be something concrete to argue about. They are not the product's prices. Nothing in the project sets a price.

What you can actually do right now

• Read the free drill. It is a complete facilitator packet, one of fourteen, published in full.
• Download the U.S. Navy Diving Manual, Revision 7 Change A, from NAVSEA. It is free, it is 987 pages, and it is the thing every card in the deck points at.
• Read what still needs a decision before this page could ever go live.