See if i can do my first ever link..
forums.moneysavingexpert.com/showthread.html?p=7757035#post7757035
I'll be amazed if that works as it hasnt gone blue but its from a martin lewis email and apparantly its an ongoing thing that amazon do but dont publicise! If you've bought something within the last 30 days & its been reduced you can claim back the difference. It tells you how to do it on martin lewis site. Sadly most of mine was bought in november. There is one DVD bought in December that has been reduced by £1, but i cant really be bothered! Might be good for someone else though