One of the best things I ever did was to do a consumer mail in offer on my consumer product packaging. Most companies either do nothing or have people mail in a “guarantee registration” that never gets used for anything.
I put a “mail in offer” for a different assortment of my products than was being sold in stores on my packaging and had people send enough for postage & handling to pay for both me sending them whatever they requested as well as a catalog of my other products.
Because my offer was not something stores could sell, and because I used the UPC codes on the retail package as worth $1 off the “mail in” offer, (my product only sold for $1 retail), buyers loved it. In fact, the WalMart buyer asked me to note my offer right on the front of my package – instead of only the backside where I had it. . .
Back when I did this, $1.00 was enough to pay for the product I sent people along with a catalog of my other products. As a result, we created a direct mail catalog company selling to consumers at a cost of NOTHING!