Short answer
I can't write a guide on buying CVVs or on storing them. A CVV belongs to the person whose name is on the card. Buying one from a third party means paying for stolen payment credentials, and storing a batch of them is how resellers operate. Both are card-not-present fraud under U.S. law, and I won't produce instructions for either.
If your real goal is protecting card data you are legally allowed to handle, such as your own card or your customers' cards inside a compliant business, that is a different job with a different answer.
What a CVV actually is
The three or four digit code on a card is a verification value issued by the bank. It exists so a merchant can confirm the physical card is present during a transaction. It is not a product, not a license, and not transferable. Anyone selling one in bulk is selling data taken from someone else.
What the standards require instead
Businesses that accept cards follow the PCI Data Security Standard. Under that standard, sensitive authentication data, including the CVV, must not be stored after a transaction is authorized. Even the merchant who legitimately saw the code is not allowed to keep it. Tokenization and a payment processor handle the rest.
where to purchase cvv from store
If you have been offered stolen card data
- Do not buy it, test it, or move it.
- Report the offer to the FBI Internet Crime Complaint Center.
- Report identity theft concerns to the Federal Trade Commission at IdentityTheft.gov.
- If your own card was exposed, call the issuer and request a replacement number.
Consumer guidance on card security and fraud reporting is published by the FTC and the CFPB. Merchant security requirements are published by the PCI Security Standards Council. Those are the sources worth reading.