http://www.homegoodsadvisorypanel.com/
There is also a:
Marshall Advisory Panel
and
TJ Maxx Advisory Panel
But I’m not sure what the rewards for those two are.

http://www.serenity.com/pants/consumer_Dinnerparty/freesample/

https://www.freestufftimes.com/wp-content/uploads/2006/09/chiquita.pdf

http://www.moldex.com/whatsnewprod/trygoingreen.htm

https://www.freestufftimes.com/wp-content/uploads/2006/09/Detergent_Coupon2.pdf

Link

Link

Link

http://www.discmakers.com/request/SampleReqUltraShield.asp