consumer panel site ask u to either complete an online survey or to go to one of their centres to try new products (which you can decline), you test the food and then discuss in a group the product you have tested, you then have to fill in a survey it all takes a couple of hours. They also pay u £5-£50 in cash or shopping vouchers.
Site:
CCFRA - Campden & Chorleywood Food Research Association - Consumer Panel
Please note, this is only available in Britain