Well there's always eBay or Nextag I think it is, where they find a product then compare prices from different retailers (also shopping.com?). Other than that you would just have to call around or browse the web for different grow stores. I think I got a fairly cheap one at American Agriculture. If you could find their web site...? I think it was <$60. They usually have "lower priced" stuff than most competition. I would steer clear of the low end Hannas. I think mine is Control Wizard.