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I would send a "Thank You" card and a gift. You could also leave a positive review for that person online and let them know in the card so you are helping their business. I wouldn't send a tip or fee.
I agree with many of the above. A great review goes a LONG way on the internet. Zillow, Trulia, etc. A gas gift card might be nice but it really does go with the territory. Bottom line, referrals are priceless. Kudos to you for at least recognizing their hard work. Most people do not realize how Realtor's are paid.