[billybye]

Both Lowes and Home Depot have a much, much larger selection online. I believe you can have shipped to store at no charge.

[Marathon Man]

Here is something that I would like to add. I buy 4 1/4" filters rather than 4". It fits perfectly. Perhaps some units take the 4" and others take 4 1/4"?? I buy them on line because I only see 4" in the stores.