3rd Party Used Price history for iRobot Replacement Filters - For 440 Unit http://camelcamelcamel.com/product/B000YDJZ6I Price history by (the extremely awesome) camelcamelcamel.com en-us Sat, 18 May 2013 15:01:44 -0700 DANAZON feeds@camelcamelcamel.com (Camel Feeds) dan@shup.com (Daniel Green)