they will email you when they have products available for testing, only people who have signed up can get them. Click where it says “Click here to join“.
http://www.appliedresearchwest.com/pentel2/pnellogn.htm -Pentel makes pens, you might receive some of their new ones if you sign up for this
http://www.kashi.com/account/new -Other member benefits include access to exclusive coupons and the opportunity to become a part of the Kashi Taste Tester Panel.
http://www.millsadvisorypanel.com – they do product testing and have surveys that can earn you amazon GC’s and paypal cash. They haven’t had signups available in a long time and will probably fill up quick though
https://www.eagleeyes77.com/login.aspx -click register. They are looking for younger people between middle school and college mostly I think.