Try this and get stuff for free!
Do you want to save on your grocery bills?
Every company has departments that handle customer satisfaction, and every company also gives away their product for FREE for various reasons. The reasons a product is given away for free is a customer with a complaint, a defective product, or for customer loyalty.
So what exactly do you do?
Go to your pantry and look at everything you have, from cat food to bread to cereal and everything in between. All of these products have an address for the manufacturer. All you need to do is simply write the manufacturer a letter telling them how you felt about the product. If you liked it, tell them what made you like it, and also be sure to tell them that you plan to keep buying it (they love hearing this!) If you didn't like it, tell them why. Tell them how they can improve their product and offer any other suggestions you can. These letters do not need to be long, a few sentences will do just fine.
Be sure to include at the end of your letter "I would appreciate a coupon or two to compensate me for the postage costs and time spent bringing this information to your attention."
Always include the UPC (barcode) off the packaging so that they know exactly the product you are discussing, and don't forget to put your return address on the letter! Over 90% of the companies that you write will send you a free voucher for a product! Note that these vouchers are not "cents off" or "Buy 2 Get One Free," these vouchers are usually for totally free items!
(quoted from Laura - secret mystery)