http://jskis.com/pages/signup -fill out the form to get Free J Skis Stickers

https://www.soils.org/stickers -fill out the form to get a Free I Love Soil sticker from the Soil Science Society of America

http://www.smile365days.org/free-sticker.html
https://www.lpmn.org/bumper-stickers/ -MN only
http://onpasture.com/2015/01/05/proselytize-for-soils-with-free-stickers/ -bottom of the page

http://www.backcountry.com/Store/global/stickerRequest.jsp  -they have a new colored sticker available every month on the 15th.

http://www.gunnars.com/form/machform/view.php?id=3254
http://www.warondiabetes.org/free-wod-bumper-sticker/
http://www.mcdermottformayor.com/get-a-free-bumper-sticker/

http://www.lafc.com/#Originals -fill out the form to get a Free Los Angeles Football Club sticker

http://www.independentvoterproject.org/free_sticker -fill out the form to get a free Awake Sticker from the Independent Voter Project

https://actionnetwork.org/forms/get-your-free-bumper-sticker -fill out the form to get a Free Elizabeth Warren for President 2016 Sticker

http://www.rand16.org/free_sticker -fill out the form to get a Free Rand Paul for President 2016 Sticker