I make my own. I use a bi-fold business card. The first page lists my name/number, what I do, shows that I'm legal & insured. When you open it, I quote the inside and inside/outside prices separately and a ref number, so when they ring back I know who it is. I also quote that this price is good for 2 months only. When you turn it over, its written in English as well. I buy business card type paper to print on. I always speak to the manager if I can, and wearing a uniform, and most importantly try and get the sale before I leave. If the shop isn't open I usually make a note in my diary, and call back when it is. I find this way, I get less rejections and the client (I hope) percieves this more as a professional service.
In the beginning I would devote an entire day to this, you also get into the swing of it more. I try to bide my time with each client, asking what problems he has, and what business is like. I find they like to know there contractor before spending money on there services.