Product review (5 stars): Samsung Replacement filter
This is an OEM replacement filter for your Samsung refrigerator.  There are some issues with the numbers (old number ended in an a, new run ends in b) but this is probably what your looking for.  No issues considering what it is, and not a lot of options for generics (at least at this point in time) so you might as well get it from the cheapest vendor you can find.  Make sure you check the multiple quantities sold on here; the two pack was almost the same price as the three pack when I made my purchase.

All in all, quick delivery, OEM part, easy install, good price (compared to the 'alternatives').