Happy Face Express via Amazon offers Prime members the Sony Silver Wired Stereo Headset for PlayStation 4, PlayStation 3, and PlayStation Vita, model no. 3000398, for $27 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $4.98.) That's $4 below our March mention and the lowest total price we could find by $4. It features 7.1 surround sound, retractable boom microphone, in-line controls, and USB.
Dell Home offers the Sony PlayStation 4 Camera, model no. 10040, bundled with a $25 Dell eGift Card for $49.99 with free shipping. Assuming you'll use the gift card, that's $9 under our March mention and the best price we've seen. (It's a current low by $20.) This camera connects to the PlayStation 4 and acts as a motion sensor.