This site gives you points for filling in surveys and testing products which you can exchange for Amazon vouchers as well as loads of other vouchers. you don't get paid too much here so it might take a while (60,000points = £12) I've had £40 so far and have never been invited to test anything, just by filling in surveys.
http://uk.testandvote.com/contenu_en/body/inscription_en.php?affil=onelovemag
non referal http://uk.testandvote.com
