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Although there are a few stragglers who trick people into believing this plasmid is real, there is no evidence to suggest that it exists. In simpler words, there is no such plasmid as Decoy 3.

According to the BioShock Wiki, it's first available for purchase from the Gatherer's Garden in Fontaine Futuristics for 120 ADAM (BioShock 2) and can be purchased for 120 ADAM in Gatherer's Gardens onward the first machine in Operations (Minerva's Den).

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