This is the one we use: http://public.homeagain.com/index.html
From what I understand you can switch to whatever service you choose after the chip is implanted. My breeder had signed us up for one service initially (I think AVID) but the vet recommended Home Again so they switched us over.
One good thing about Home Again is they have a 24 hour vet hotline you can call to speak to a vet. It's been useful for us on several occasions since my lab tends to eat things he shouldn't.

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