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
DIAMEX AVR ISP: ISP programmer for Atmel AVR, USB port at reichelt elektronik
Standalone AVR ISP Programmer Shield Kit - includes blank chip!
ISP Programmer for AVR Microcontrollers : 4 Steps - Instructables