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Paific Poker and all the Prima skins will give you ten dollars if you sign up with them, no credit card required.
(You can only do this at one Prima skin, not all as if you play at 2 skins you have the same account for both)

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I've actually received $10 free on both Royal Vegas Poker and Crazy Poker (both Prima skins) with the same account. Crazy Poker required me to register a credit card, however.