I can't put together a buying guide for CVVs, cheap or otherwise. A CVV is the security code that proves someone physically holds a card, and the market you're describing runs on card numbers taken from other people without their consent. Writing advice about where to shop for that, how to spot a "legit" seller, or which payment methods to use would just be a fraud tutorial with extra steps.
That isn't a technicality I can write around. Every card in those channels belongs to a real person, and the money moved is usually charged back to them or to a merchant, not to the person buying the data. The people who get hurt are ordinary account holders, small businesses eating chargebacks, and occasionally the buyer, who is a natural target for exit scams and for extortion once a seller has their details.
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If what you actually need is one of these, here's where it legitimately lives: virtual card numbers from your own bank or a service like Privacy or Mercury issue single-merchant card numbers you control, which solves the "I don't want to hand over my real card" problem. Prepaid cards bought at a pharmacy or grocery store give you a spendable card without a credit check. If you're testing payment flows as a developer, Stripe, Adyen, and Braintree all publish test card numbers and sandbox environments for exactly that.
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If you want, I can write about any of those instead, or about how card-not-present fraud gets detected from the merchant side.