This is the same price as the slim version at Walmart, I'm guessing it got price matched from the wrong item.Add-on item.http://www.amazon.com/dp/B015SY3W7K/?tag=cl03f-20&psc=1&smid=ATVPDKIKX0DER
I see this is sold by Amazon but in general be careful there's a lot of water filter counterfeits on amazon. Price mistakes can be too good to be true.
I wouldn't think it's a risk at all considering it's 50% off.