Brent,
What zipcode did you use when looking for that coupon? I tried Columbia (21044) and unless I missed it, I didn't see any coupons that would apply to the microfilter. I guess it may have expired?
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2000 Silver Ice SE 4X4 Auto
also known as 2xterras on Edmunds Bulletin Board
Pictures of my X:
http://albums.photopoint.com/j/AlbumIndex?u=1406935&a=10805120