Hugh,
Another great Amazon tool isn’t really Amazon at all. To determine whether today’s price is the best price, copy the item’s URL and go to camelcamelcamel.com [1]. There, you’ll be able to see a historical chart of the item’s price and set up a notification when the item reaches the price you’re comfortable with (not only on Amazon but with third party sellers as well, if you’re so inclined).
Camelcamelcamel.com is a great tool, if you don’t need to buy it today, for those items that may be more costly and in your budget at a lower price. – Dayzymom