Hmm, that's about $24.00 Canadian/US dollars. There's this:
. $27.00 dollars
I was looking at the stella USB converter and it was around $40.00. I have a sega 6 button controller, and two wico ergonomic controllers.
The wicos are excellent. Although, the metal joystick on one of them snapped. I had to go to a machine shop and get them to make a replacement. In the meantime, I use my logitech rumblepad 2. Once you mess with the deadzone and sensitivity settings, it works really well. I'm sort of off on a tangent, because it looks like Anna wants just a simple atari/usb joystick. Like this: