At first glance, $30 may seem like a lot for a one-button old school Atari joystick with a USB connection. But this one comes with the Stella Atari 2600 and 80 games built right in and you can remove the USB controller board for use with that MAME cabinet you’ve always wanted to build. There’s even labeled solder points on the board for adding additional buttons.
As for the emulation part of it, the Stella emulator “includes TV effects such as Color Texture, Image Noise, and Color Bleed to reproduce the imperfections of a tube TV.” Of course, you can turn those effects off in favor of the boring crystal clear picture on your LCD monitor.
Included games appear to be a combination of clones and spin-offs (for legal reasons) but the product page points out that you’re free to download ROMs from elsewhere on the internet.
Clear Classic USB Joystick [Reflex Audio Systems]