APlusChoice via eBay offers its APlusChoice 5-Stage Home Drinking Water Filter Purifier for $48.94 with free shipping. That's tied with our mention from a two weeks ago and the lowest price we could find by $9 (outside of the deal below). It can be attached to the kitchen tap or installed under sink and includes installation hardware.

A close price, YescomUSA via Rakuten offers a similar kit for $49.90 with free shipping.