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Good buy, I talked to someone about them and got this link: https://bulbapedia.bulbagarden.net/wiki/T_Promotional_cards_(TCG)
that should explain the whismur line. The chansey is good too, not worth as much (about $10 right now) but still very hard to get. Apparently, a full set of the imakuni?'s whismur line should go for $50.
How did you come across them, if you don't mind my asking?