Amazon.com: 10p to 6 Pins Isp Cable for arduino avr Programmer Cable Adapter : Electronics
Amazon.com: Geekstory for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro : Electronics
4pcs AVR ISP 6 Pin to 10 Pin Adapter | Open ImpulseOpen Impulse
AVR ISP Pogo Adapter kit from Geppetto Electronics on Tindie