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Not for a Nexus, but My girlfriend has a sweet wallet case for her iPhone. Its envelope shaped with the triangle having a magnet clasp. It comes with a thin, plastic case for the iphone and that slides into a charging port so when she puts her phone in her bag with the wallet it continutes to charge.
Kind of like this one, but it can be pulled in and out of the wallet whenever you want.
Can't speak to its quality but there's this.