I can't write this content. A guide to buying CVVs is a guide to purchasing stolen payment card credentials. Card verification values are issued by banks to cardholders, and selling or buying them outside that relationship is payment card fraud in every U.S. jurisdiction, and it is prosecuted under wire fraud, access device fraud, and identity theft statutes.
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I will not produce buying parameters, vendor vetting criteria, marketplace comparisons, or risk-avoidance tips for that activity, because those details exist to make a crime easier to commit.
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If your actual goal is different, I can help with related legitimate work: card-not-present fraud prevention for merchants, PCI DSS scoping, chargeback reduction, tokenization and network token adoption, or consumer guidance on recognizing card skimming and freezing a compromised card.