What’s the catch? This is the best deal I can find on the internet by a fair margin. This seller has an amazon store page as well and seems to have a good reputation on both. The seller claims its a new HDD from a reputable brand and offers a 5 year sellers warranty.
Oh sorry I didn’t realize the ebay post was for a new drive. I just automatically assumed ebay was used/refurbished as well. My bad this doesn’t compare as I was expecting.