In Port Royal there are some rare ones in Murky Hollow (I'm not sure if that's what it's called though...), and there is another place wherein they're more common... Anyway, on Padres, you an find them on the back beach and in the catacombs. On Cutthroat they're commonest, and easiest, due to their space. There is a Looking for Guilds advertising section up top, which you might wanna check out
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And welcome aboard!