I am new to Lego investing, so in hopes of trying to keep up on the Amazon prices without wasting every hour of every day, I set out to look for something that could track prices and notify me when it/they dropped below a certain threshold. I didn't see anything on Amazon that could do something like this, but I did find a third party website called "TheTracktor" that could help with this. You pick out the Amazon set(s) you want to track, set a price level, and wait for an e-mail notification that the price has dropped on your item. http://www.thetracktor.com So far, the site has worked well. It's bare-bones and doesn't do much besides its intended purpose, but it seems to work well. Anyone use this site, or have a better one (or perhaps an Amazon function that I overlooked)?

http://www.camelcamelcamel.com may be the go-to one for many others. I haven't personally heard of the one that you mentioned, but I use this one frequently.