A CVV is the security code used to authorize a card-not-present transaction. Content framed as a guide to buying CVVs online is, in practice, a guide to buying stolen payment credentials, and that is fraud under US law (18 U.S.C. § 1029 covers access devices, and carding operations are prosecuted under wire fraud and identity theft statutes as well). I won't write a buying guide, a vendor comparison, or a parameter checklist for that market.
If your goal is legitimate, here are directions that do not involve other people's card data:
If you tell me which of those you actually need, I can write the guide.
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