There are low cost AVR programmers, such as [1]. Similar are available for much less on Aliexpress.
You can also easily use an Arduino, a solderless breadboard, a few jumpers and some software as an AVR programmer [2].
[1] https://www.sparkfun.com/products/9825
[2] https://www.instructables.com/How-to-Program-an-Attiny85-Fro...
Re:Arduino Uno R4
by josephcsible on Monday March 27, 2023 @01:23AM
(#35323135)
Generic AVR programmers go for about $8 on Amazon.
Were you able to program them without additional (expensive) hardware?