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
Amazon.com: 10p to 6 Pins Isp Cable for arduino avr Programmer Cable Adapter : Electronics
Pololu USB AVR Programmer v2.1
Adafruit 6-pin AVR ISP Breadboard Adapter Mini Kit : ID 1465 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
1 Set 10Pin To 6 Pin Adapter Board + USBASP USBISP AVR Programmer USB ATMEGA8 ATMEGA128 ATtiny/CAN/PWM 10Pin Wire Module - AliExpress