Tiny AVR Programmer - Two ISP headers to use with other AVR microcontrollers - Plugs directly into USB port: Attiny: Amazon.com: Industrial & Scientific
USBasp 3,3V 5V Isp Programming Device, USB Programmer For Atmel Avr and Arduino | eBay
Arduino as ISP and Arduino Bootloaders | Arduino Documentation
Amazon.com: HiLetgo USBTiny USBtinyISP AVR ISP Programmer 6/10 Pin Bootloader for Arduino UNO MEGA : Electronics
Arduino as ISP and Arduino Bootloaders | Arduino Documentation
Arduino as ISP and Arduino Bootloaders | Arduino Documentation
MRP01 - USB AVR Programmer
Arduino as ISP and Arduino Bootloaders | Arduino Documentation