I've been adding one or two of these to any Amazon orders I have been placing. Only $1.00 each. It helps out if you need to meet a minimum amount to qualify for free shipping too. I've given them out to coworkers and also have left them in geocaches and doctors offices.
http://www.amazon.com/gp/product/0880801441/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=0880801441&linkCode=as2&tag=dietry-20
http://www.amazon.com/gp/product/0880801441/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=0880801441&linkCode=as2&tag=dietry-20