I have an Alaskan airlines milage incentive. When a client buys from me, I give them a refferal bonus of Alaska airlines miles, if their friends and family buy from me. The miles depend on their purchase. It works well.
Where I am, just returning phone messages and showing up (especially on time) will get you more referrals than anything else I've tried.
Birddogs work but if they don't run into anyone for a few months that need your services they tend to forget you.
Word of mouth has been, by far, the best for my businesses.
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