Pat,

In the past I have purchased from Filters Fast at http://www.filtersfast.com/

as well as from http://www.waterfiltersonline.com

There is also http://www.Great-water.com who I believe are the Dessalator rep in the U.S.

Prices vary - much cheaper by the case.

Hope these help.

Derick Gates

SM2K #400 Brava