Amazon.com: Geekstory BS-708 G-Mouse USB GPS Dongle Navigation Module G7020-KT Chip External GPS Antenna with 4M Flash USB GPS Receiver for Raspberry Pi Linux Windows 7 8 10 : Electronics
RAC-GEO GPS External Antenna | JAMAR Technologies
GPS Antenna - External Active Antenna - 3-5V 28dB 5 Meter SMA : ID 960 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits