A Sales Referral System Like No Other
I know of an owner of a small automobile dealership who very much wanted to put in place a sales referral system. However, his funds were limited. The low-cost solution was simply to "publicly" thank his customer for his/her purchase.
Here's the sales referral system that he implemented.
A few days after the purchase, the dealer would have delivered to the customer, a helium-filled balloon and a thank-you card delivered to the customer's place of work. And because helium-filled balloons must be anchored - otherwise they float up and away - the customer would have to tie the balloon's string to the back of his/her office chair, workbench, etc. The customer's co-workers naturally would be curious and ask about the balloon. This opened up an opportunity for the customer to talk about his/her new car, the auto dealership, etc.
I'm told that the dealership enjoyed about a 50% increase in sales within the very first year using this simple referral system. And all from "publicly" thanking the customer by presenting him/her a helium-filled balloon and a thank-you card costing the dealer less than $10.00.
Of course, it's not necessary to be the owner of an automobile dealership to implement this system nor even to sell vehicles. This could be done by an one-person business owner, independent sales rep. etc. selling almost anything.
Why not go for it!

