I bought it on aliexpress (" J-LINK/V9 V8 ARMAR-JTAG-20-20..."), but you can also get it in the Arduino store (J-Link 19-pin Cortex-M Adapter — Arduino Online Shop).
I bought it on aliexpress (" J-LINK/V9 V8 ARMAR-JTAG-20-20..."), but you can also get it in the Arduino store (J-Link 19-pin Cortex-M Adapter — Arduino Online Shop).