Universal ATMEL AVR ISP programmer from heilingch on Tindie
AVR ATMEGA16 Minimum System Board ATmega32 + USB ISP USBasp Programmer For ATMEL | eBay
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
Pololu USB AVR Programmer v2.1
Pololu USB AVR Programmer
KMtronic Ltd: Serial Atmel ISP programmer - AVR, Tiny, Mega