The Mini•Dub is a smaller version of the 4TW by jonyfraze, and the primary difference is how the edges are mostly straight.
The VM6R offers multiple layouts and can be ordered as a case or preassembled. It also features both Iris and Lolli tech.
Chibico by Acrycade Gear is a mini stickless controller that should be able to fit into a back pocket of a pair of pants.
The Hori Fighting Stick Mini is an average mini fightstick that might catch your eye in the sea of competitors.
The QRD Maestro S3 can either work wirelessly or with a wired connection, depending on your preference when you play.
The Skullbox Leverless Arcade Controller is smaller & thinner than average and has proprietary SkullCaps that mimic the Sanwa feel.
The pandemic inspired the inception of Wood Tier Customs as a woodworking studio that makes enclosures, sometimes prebuilt.
The Ekkusu Fight Controller is a leverless controller that is thicker than average, allowing it to use premium buttons like Sanwa.