That title really makes this thread sound like a spam bot has posted this thread...
Anyway, loads of people use Amazon and I'd be surprised if there's no one here who this guide can help out. This is totally legal and puts your Amazon account at no risk whatsoever.
All you need to do is go through your previous orders and look for items where the price has gone down by a decent amount since your purchased it. Once you've found an item you want some money back on open a live chat and, for your initial message to the rep, say something along the lines of
Obviously give all the info the rep asks for, such as your name, email and order number.I bought X and noticed the price has gone down since I purchased it. Would there be any chance of getting the difference back?
Some reps won't do it if the item was purchased a long time ago because Amazon's policy states that they will only refund the difference if the order was made in the last week. However, if that happens just open another chat and try another rep. It might take a few tries, but eventually you should get lucky and a rep will "make an exception". I managed to get money back earlier on an order I made in September last year, and again for one made in November. Got lucky on the first order and the first rep I spoke to refunded me. The second item took 4 reps, but £40 back for 10 minutes work isn't exactly bad!
As far as I know this is good for all items, and like I said there's no need to worry about getting your account blacklisted, unlike some other methods of getting money out of Amazon.
Hope it helps a few people out!