Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Warning - replacement filters hard to find

I just ordered and received this Air Cleaner but the filter amazon.com recommends DOES NOT FIT THIS MODEL (TRUE AIR 04381). Adding to the confusion, the model of Air Cleaner uses a square filter (TrueAir 04712 Allergen Reducing Filter) that amazon.com currently no longer sells. So why by the unit if you can't get replacement filters?