High-Accuracy GPS System Tracking Module - China GPS Module, GPS Positioing Module | Made-in-China.com
Columbus V-800 high accuracy GPS receiver (Mark II)
Newest UBX-M10050-KB Low Power GNSS Module With Integrated Antenna High Accuracy Support GPS GLONASS BeiDou Galileo - AliExpress
UM980 module board High precision GNSS full frequency low-power RTK di – TOPGNSS.store
SparkFun GPS-RTK-SMA Kit - Includes GPS breakout- Magnetic Mount Antenna- Ground Plate & USB-C Cable - u-Blox ZED-F9P & RTK- High precision accuracy in milimeters- Both Rover & Base station operations: Amazon.com: