Uniball 207 is a specially designed pen that prevents check and document fraud by because it becomes trapped in the paper. You can get your sample here, by signing their secure your signature pledge.
WalMart frequently offers a variety of samples. You can see what is currently available here.
SunMaid Raisins has a current promotion where you can get a Healthy Snacks with Blue book. You simply need to purchase SunMaid raisins and mail in the request with a UPC and original receipt. You can download your request here. They aren't even charging postage and the offer is good until this time next year.