AVR UPDI Standalone Programmer from microprogrammers on Tindie
DIY USBtinyISP-compatible AVR programmer
Amazon.com: Waveshare-AVR Programmer USB AVRISP XPII Compatible with ATMEL at AVR ISP mk2 mkII in-System Programmer Supports AVR Studio 4/5/6/7 Or Higher Version : Electronics
5V Micro USB Tiny AVR ISP ATtiny44 USBTinyISP Programmer For Arduino Bootloader - AbuMaizar Dental Roots Clinic