Hello Ikring,
The filter that you are refering to is the ion filter it can be order from many different online stores. I have found one that the part number is KCM50WF sell the item for $12.99 for 2 and a $1.99 shipping. I asume that you already know how to replace the filter. You might also check your local hardware store as many of them also stock these types of filters. This is the link to the store and web page the item is on
http://www.filtersfast.com/KitchenAid-KCM50WF-Coffee-Filter.asp
Thank you for choosing FIxya and please do not hesitate to ask more questions.
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