I bought 2 Sega Pads from Toys R Us circa 1992 for $10.00 each. They have worked great ever since! AFAIK I have played
every 2-button Amiga game with them.
I used my Sega pads on my A500s, A2000s, A3000s, A4000 and A1200.
Sega pads work perfectly for many years for Cammy and I. They can work for you too.

2-button controllers FTW!