Pemmican Beef Jerky is running a promotion right now, and for every bag of beef jerky you buy, you can submit a code online and receive a coupon for another FREE bag. This works out quite well if you have jerky lovers in your family! You can view the You Buy We Buy Pemmican promo here. When you enter your code for the free bag, don't forget to ALSO go enter the same code on Pemmican's reward site. You'll get 100 Pemmican points per bag, and with 500 points, you'll earn a free bag. :) That's a lot of FREE jerky! Here in Grand Rapids, I've only seen the Meijer gas stations carry Pemmican, and it's priced at $4.99/bag.
The limit is 2 free bags/month. The promo runs through October 31st. You cannot get another free bag for purchasing one bag with a free coupon. (You have to actually PAY for the bag in order to get another free.)