The ASUS X299 motherboard guide: ROG, Prime, and TUF for LGA 2066 - Edge Up
Amazon.com: EVGA X299 Dark, LGA 2066, Intel X299, SATA 6Gb/s, USB 3.1, USB 3.0, EATX, Intel Motherboard 151-SX-E299-KR : Electronics
Amazon.com: Asus Prime X299- A II ATX Motherboard (Intel X299) LGA 2066, 12 IR3555 Power Stages, DDR4 4266 MHz, Triple M.2, USB 3.2 Gen 2 Type-C, Intel LAN and Aura Sync RGB Lighting : Electronics
NeweggBusiness - GIGABYTE X299-WU8 LGA 2066 Intel X299 Motherboard with 7 PCIe x16 Slots and Dual Intel Server LAN