Product review (4 stars): Best place to buy
We have a stainless steel Kenmore side-by-side refrigerator which uses these filters.  Like any filter they have to be changed periodically and in researching places to buy them, I've found that Amazon.com is the best place to go.  For economy sake, if you can buy larger then a 3 pack, it will probably save you money in the long run.  I'll be ordering more soon since my supply is running low.