There really is no need to keep your eye on a thread. Go to dealmac.com - Find the lowest prices on iPod, iBook, PowerBook, Mac, eMac, PowerMac G5, iMac, News on Apple Mac prices. and you can register and tell it what you are looking for and they will search the web day in, day out and everytime the search engine finds a deal, it e-mails you and lets you know the details.
I just tried them and got very limited results. I'd rather go to PriceWatch.com and check things there on a daily basis.