Morgen
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Ioun Stones don't take up an item slot on your body, you can have as many as you want floating around your head. Being able to socket one into a wayfinder protects the ioun stone from being grabbed in combat and allows you to benefit from it while your sleeping/etc.
That's how you get the resonance too if your GM is using those rules. The Wayfinder would need to be on your person for this to work, not in an extra-dimentional space or something like that.
Morgen
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They can only be found in the Pathfinder Chronicles: Seeker of Secrets Book. They are campaign rules rather then standard RPG rules so they aren't in the PRD.