Its getting cold in my neck of the woods and soon will be using the wood stove. My Air cleaner that I run in the living room is old. I really have to replace it. Does anyone own one that does a good job? I have looked online and tried to find a consumer report on them no luck.. The replacement filters on them are so pricey. Using a wood stove I would imagine I would have to replace the filter half way though the winter.. And the filters are around $100.00.. Any one have any suggestions for one that is under $450.00?...