We found ready to buy on Aliexpress.com a new SoC miniPC fanless with Intel and Windows 8.1 called DL3735F-MPC-01.
MPC-01 has SoC Intel Bay Trail Z3735F Quad Core with 2GB RAM and expandable memory 32GB eMMC storage, wifi b/g/n and Bluetooth 4.0. This mini PC support 4 USB ports, 10/100 RJ45 port, HDMI output, MicroSD reader and audio jacks for input. The case of this mini PC looks, especially if it is finally metal because it has enough ventilation slots, which is quite necessary to cool the Intel SoC Z3735F having thermal issues on multiple computers that we have described.
This new MPC-01 mini PC can be purchased on Aliexpress.com from around €105 ($114) shipping included, although the store is offering coupons for $ 10 at this time.