How to Program AVR Microcontroller Atmega16 Using USBASP programmer and Atmel Studio 7.0
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
GitHub - wagiminator/AVR-Programmer: Collection of AVR Programmers and Accessories
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AVR/ATmega/ATtiny Standalone ISP Programmer from microprogrammers on Tindie
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Kanda - USB AVRISP AVR Programmer for AVR Microcontroller Programming
Pololu - New product: Pololu USB AVR Programmer v2