I was thinking of an idea tonight, kinda sounds original to me at least, maybe you guys already do something similiar, but I figured I would post it here to see what you guys think about it. What if you drew up a short letter that said some stuff to the point that my business is looking to add on more clients like you since your soo good, blah blah blah. We would appreciate if you would give this business card to someone and reccomend our quality service. We will be enclosing one business card a month with your invoice, try to pass our company along during your travels. Drop a business card in every invoice you send out. It won't cost much at all, you only have to put the letter in the first time you do it. What do you think?? It's low cost, and if you hit the right type of clients with it I think it could work.