Apnoti.com is worth checking out: the idea behind this free service is as clever as it is simple.
You copy and paste the URL of the bestest item from your Amazon wishlist into the box provided, along with your e-mail address.
Then, if and when your chosen item is reduced, the service will ping you with a notification!
You can also use the service to keep an eye on items that you have purchased already; apparently, if Amazon drops the price of any of those items at a later date, it is willing to refund you the difference.
This works for amazon.co.uk, amazon.com, amazon.de, amazon.fr and amazon.ca.
If you save any money with this one, let me know…