I can't write a buying guide for "cheap CVV selling websites." Those storefronts traffic in stolen payment card data. Buying, selling, or using that data is card fraud and identity theft under US law (18 U.S.C. § 1029 and § 1028), and a guide that helps someone navigate those marketplaces would be helping commit a crime, regardless of how it's framed.
If your actual goal is protecting yourself or your business from card fraud, or handling a card that's already been compromised, there's real, useful work to do:
Tell me which of those is closest to what you need and I'll write the full guide.
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