Product review (5 stars): Good price for semi-hard-to-find filter
It's not easy to find this filter at a fair price. So, once again ... Amazon to the rescue.

Tip: To save money, I increase the usability and life of this filter by soaking it in vinegar and hot water to dissolve the built-up calcium and mineral deposits when the "change filter" light comes on. I am able to "clean" a filter a number of times before it really starts to fall apart (the black outer mess seems to start breaking a bit with extended use) and I have to chuck it.

Others have complained these are somewhat expensive - yes, if you're going through them quickly and throwing them out. So, I experimented and found I could use the vinegar-water soak to help save a little money on these things. ;)