Honestly you could probably find a Refurbished graphics card for less than $100. Also, keep in mind the minimum Graphics card requirements for Black Ops 3!
These 2 cards are well above Black Ops 3's GPU minimum. But keep in mind that many people have had some weird lag spikes and they are using GTX 980s and other high-end cards. I'm using a Gigabyte GTX 750 TI and my game runs fine. Solid 50+ FPS. I only checked Newegg because they are always my #1 choice for PC hardware. If you are looking to run at max graphics then I would definitely save up. I run at all "High" settings and a couple "extra high". Game looks great.