check this out,
which TINY ? grab this and put it on the Arduino you already have and go to town.
IMO , you can’t beat a Tiny85 anything bigger is better on arduino,
84 if you want more pins.
Use the AtTinyCore LIB on Arduino IDE and this link:
ATtiny 25/45/85
HTH
GL 
PJ 
fyi , read the GitHub link and there are a million usb Programmer Clones out there. .