The Replacement Filter 9 1/2 x 7 1/4 can be purchased onthese websites: http://www.officecommunications.com/storefront/Filtrete-Replacement-Filter-9-12-x-7-14-P-6670and http://www.suppliesguys.com/supplies/Air-Purifier-Filters/OAC100RF.htm
You can buy one for a good price on amazon.com by going to this site - http://orderactivatedcarbonairfiltera.blogspot.co.il/2012_02_01_archive.html
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