That's an okay site, but the "deals" are usually not "deals." It seems to break down like this: 1 in 20 is a really good deal (maybe 40-60% off retail) but usually it's sold out in a matter of minutes when it hits the front page. About half are just okay deals. Like maybe 10-15% off normal. And the remainder are just awful. Like no deal at all. More than Amazon for the same thing type stuff.
But let's call a deal a deal when it's really a deal. It sure seems to be funny how about half the posts are for the exact same retailers time and time again.
If you want to find a real deal, look at Bens Bargains or Slickdeals.net. You'll have to search and not everything is homebrew related, but I do know that I almost always see the same item listed on Slickdeals before I see it on homebrewfinds.