Adafruit 6-pin AVR ISP Breadboard Adapter Mini Kit : ID 1465 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits
AVR ISP Pinout
Pololu USB AVR Programmer v2
USBASP USBISP AVR Programmer USB Adapter + 6 to 10 Pin IDC ISP Connector Cable | eBay
AVR ISP connector with pogo pins - Daumemo
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