A leverless controller is supposed to eliminate sluggish joystick movements. Sometimes, it has only buttons or a mixture of buttons and keys.
This is a budget controller that is available in many variations and is a decent option if you would like to try leverless controllers.
Ash Huang presents this controller that is available in leverless, WASD, fightstick, and custom formats with custom art as well.
This is an all-keys controller with keys that are straight instead of being slanted, but you can also request different layouts.
Fightstick Guy offers a few premium fightsticks, one of which is this M. Bison edition that has golden Sanwa parts.
Brook is best known for providing printed circuit boards, so this fightstick that was once limited edition was a surprise to see.
Stickless offers some of the most customizable controllers in the history of the fighting game community, including performance & appearance.
Mixboxarcade created a controller that combines arcade buttons with keyboard arrows and crafted it with much dedication.
Germany contributes to the fightstick community with this good looking all-buttons controller that might appeal to you.