Newegg offers the Sony DualShock 4 USB Wireless Adapter for Windows and Mac, model no. 3001625, for $14.99. Coupon code "EMCFGHF27" cuts the price to $9.99. With $2.99 for shipping, that's $2 under our mention from two weeks ago and the lowest total price we could find now by $6. It allows you to wirelessly connect a PlayStation 4 DualShock controller to a PC or Mac and play games streamed to your computer through applications such as PS4 Remote Play for Windows and Mac and PlayStation Now for Windows.
Note that this item is non-returnable and non-refundable.