If you leave items in your cart (place them in the cart and then 'save for later'), when you log in, hit 'cart' and it'll show you the updated prices of everything in the cart. You'll be surprised how much stuff goes up and down.
Some stuff may go up, usually comes back down but it may take a bit. Some stuff goes down, then goes back up, etc.... if it's something you feel "should" be somewhat cheaper, and you don't need it right away, I'd stick it in the cart and check daily.