Targus' Thunderbolt 3 Dock can drive two 4K monitors and packs plenty of I/O at $195 (35% off)
Docking Stations | Enhance Your Productivity | Targus US
Targus Universal 4K Laptop Docking Station, Single 4K or Dual HD Video, with Charging Power, Audio, & 6 USB 3.0 Ports for PC, Mac, & Android (DOCK130USZ)
Targus DV4K USB 3.2 Gen 2 Type-C Universal Docking DOCK192USZ
Targus USB-C Universal DV4K Docking Station with Power - DOCK180USZ - Walmart.com
Targus Universal 2K Laptop Docking Station, Single 2K or Dual HD Video, with Charging Power, Audio,
Targus USB-C Universal Dual 4K Docking Station (DOCK190USZ)