I don't think bidding at the end results in many instances of getting something cheaper, at least not much cheaper. My long standing rule is to bid most of what I'm willing to bid right away, saving a high bid til the end if I happen to think of it. The best way to spend more than you intend to (and more than an item is worth) is by getting caught up in that last minute bidding war at the end.
My advice is to watch for auctions ending at "bad times", ie times when not a lot of people are online (say, midweek in the day). Then enter a proxy bid for the most you're willing to pay. Then sit and back and let it do its thing.
If someone outbids you, remember that in a moment of calm & collected thought you put a rational limit on what the product is worth. If someone "wants it more," just bear in mind that to bid more would mean you paid more than you "knew" you should. Sit tight and wait for another item to come up. It usually will.