Product review (5 stars): Samsung DA29-00020B Refrigerator Water Filter
I bought the two pack and they are original equipment Samsung refrigerator water filters. There are other cheaper replacement water filters. Read the details. Not all replacement filters have as high a NSF/ANSI certification, 53 for this particular filter.

As a side note, when we moved we took our Samsung refrigerator with us. I didn't hook up the water line to the refrigerator right away, wanting to wait until I got the replacement filter. In the meantime, I tried to remove the existing filter, with no luck. I later learned if water isn't being supplied to the refrigerator, it's nearly impossible to pull out the existing filer. Once I got the replacement water filter, I hooked up the water supply line, turned the existing filter to the unlock position, and was able to easily pull out the old filter.