eBay has the Intel Core I7-7700K 4.2GHz Quad-Core Kaby Lake CPU (BX80677I77700K) for $310 - $15 off with coupon CSAVE15OFFMARCH (Ends 3/20 at 8PM PT; requires Paypal) = $295 with free shipping. List price: $350. Features socket LGA 1151, intel 200/1001 series chipset compatibility, intel HD graphics 630, intel turbo boost 2.0 technology.
Amazon has the HP VR1000-100 Windows Mixed Reality Headset & Controllers (2018 model) for $199 with free shipping. Has good Amazon Reviews.