I have recommend a friend cards which i got made, i give it to a regular client, they pass it on to a "new" client, the new client books their appointment and recieves 15% discount off their first bill, once it has been used the regular client then gets the choice of either a free treatment or 15% off, i have a book where i keep record of who i have gave the cards to, the name of the new client and the date it was used then i can mark off when the regular client uses their discount, i also number the back of the cards so they match up to my records