I can't write this one
The request is for a buying guide about selling CVVs, which means card verification values taken from payment cards. That data only has value to a seller if it was obtained without the cardholder's consent, and buying it is the front end of carding fraud. A guide covering sellers, prices, minimums, and vetting would be a how-to for that, so I'm not going to produce it.
Where to Sell CVV Cheap: A Buying Guide
If you're working on something adjacent and legitimate, I'm glad to help. Real options include payment security research with proper authorization, fraud prevention content for merchants, chargeback and dispute education for consumers, or writing about how card-not-present fraud works from a defender's point of view. Any of those I can do well.