Product review (5 stars): And we have water!
Samsung DA29-00020B Refrigerator Water Filter:

I do a lot of price checking to see where I'll get the best price and shipping deals.  Found it here, it fits the fridge, it works and is easy to install.  The only thing I'm never quite sure of is how to dispose of the old ones.  It arrived quickly, it gets the job done and that about sums it up!