51 AVR ISP Downloader module USBasp USBISP 3.3V / 5V AVR Programmer USB ATMEGA8 Downloader Cable for Arduino - Newegg.com
In-system programming - Wikipedia
Amazon.com: Compatible Atmel AT AVRISP mkII AVR ISP mk2 USB MCU AVR XMEGA In-System Programmer Studio 4/5/6 ISP PDI interface @XYGStudy : Electronics
Amazon.com: waveshare AVR ISP in-System Programmer Compatible with at AVRISP mkII from ATMEL Support All AVR Devices with ISP or PDI Interface Support AVR Studio 4/5/6/7 : Electronics