Check out this amazing new site Vocalyz. They reward you with Amazon vouchers for taking regular surveys. Best of all you get £1 free just for joining. The surveys are free to take and they'll send you an e-mail invite for each one. The rewards stack up quickly and this is a great way to save money on Amazon.
Joining only takes a couple of secs. Just fill in your details and confirm the link they send you via e-mail.