Seagate 1TB/8GB Hybrid HDD $84.99 NewEgg ShellShocker 10AM-12:59PM PT
NewEgg ShellShockers are usually free shipping, but I don't know for a fact that it will be.
I believe this is the cheapest I've seen this drive, but I could be wrong. I'm posting this because a lot of people were putting them in their PS4s.
If the link doesn't take you directly to the HDD, it should be the second item in the carousel.
Title was previously Samsung, it's a Seagate. Sorry about that, I misread it.
Replies are correct, a 3.5 inch will not fit in a PS4. Total fail on my part. I apologize...