Usually, Etsy has controllers sold by boutique stores based out of people’s homes, but occasionally, you can find mainstream controllers there.
The Pocket is a mini all-key controller by Perfect Clear with two extra DSA keycaps on the upper right side.
The KeebBrawler-01 is a mini stickless controller that most notably has a wide jump button and unique attack button layout.
The Titan is loosely based on the Sega Saturn controller, and one of its many unique features is having a customizable encoder knob.
The Neobox is an enlargement of the open source Flatbox. It also spares you from building a Flatbox yourself.
The Slab Mini All Button Controller is a sandwich acrylic case controller with hot swappable sockets and LED.
Arborcade makes classy wooden controllers without sacrificing performance, such as a walnut or mahogany controller with Sanwa buttons.
The Stress Pocket Arcade Fight Pad is a mini WASD controller with unusual angles that may appeal to you more than the usual layout.
The 4TW cast-acrylic case by jonyfraze can be ordered in preassembled or DIY formats as well as different layouts and art.