A:AnswerI got different answers from different stores. One store (the one selling it at 70) said that's the price at any best buy on the country. My store across town from that one said only at that store, they wanted 199. Needless to say, I bought them at the store across town lol.
A:AnswerMost noise canceling headphones have some audio feedback when the noise cancelling is on though I'm not a 100% sure this is the issue you're having
A:AnswerSo as long as your PS4 has a headphone jack, it will work. I have an Xbox and it plugs directly into the controller in the 3.5mm slot, so I'm sure the PS4 has a similar feature.