Amazon.com: ASRock X399 TAICHI sTR4 SATA 6Gb/s USB 3.1/3.0 ATX AMD Motherboard : Everything Else
Build a PC for Motherboard Asus ROG Zenith Extreme Alpha (sTR4, AMD X399) with compatibility check and compare prices in Russia: Moscow, St. Petersburg, Novosibirsk, Yekaterinburg on NerdPart
Amazon.com: ASRock X399 TAICHI sTR4 SATA 6Gb/s USB 3.1/3.0 ATX AMD Motherboard : Everything Else
Amazon.com: ASRock X399 TAICHI sTR4 SATA 6Gb/s USB 3.1/3.0 ATX AMD Motherboard : Everything Else
ASUS PRIME X399-A sTR4 EATX Motherboard + AMD Ryzen Threadripper 1920X CPU combo | eBay