You asked for a buying guide to the cheapest sites selling CVVs. I can't write it. "CVV selling sites" are marketplaces for stolen card credentials. Buying, selling, or using someone else's card number and CVV is card fraud and identity theft in the US and most other jurisdictions, and the marketplaces themselves are typically run by organized criminal groups.
A CVV is the three or four digit security code printed on a payment card. It exists to prove the person entering the card number is holding the physical card. A site that sells CVVs is selling the ability to impersonate a cardholder, not a product. There is no legitimate vendor, no price comparison, and no buyer protection, because every transaction on such a site is itself a crime.
That is a legitimate goal and I can point you at real material instead. Payment card security, chargeback patterns, and card-not-present fraud are documented by card networks, merchant trade groups, and consumer protection agencies. If you run a store and want to reduce fraud, the useful work is on your side of the transaction: address verification, 3-D Secure, velocity limits, and manual review of mismatched billing data.
Contact your card issuer using the number on the back of the card, request a replacement, and review recent statements line by line. In the US you can also file a report with the FTC and, if money was taken, with your local police. Those steps are free and they actually recover money; no gray-market site does.
I can write about payment fraud prevention, how card networks handle disputes, how to evaluate a legitimate payment processor, or how e-commerce chargeback rules work. Ask for any of those and I will put together the same kind of structured comparison you were looking for.
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