Instead of shelling out $150+ for a genuine Sega-brand Saturn-style USB gamepad, I got an old Sega Saturn gamepad and a cheap USB knock-off and transplanted the USB controller PCB into the old pad.
However, before the transplant, a USB wire broke while testing. The cheap pad's cable end sleeve (what's the correct term for this?) was too loose and I suppose the solder joint had rattled apart. I put some electrical tape on it to make it a tighter fit.
I also soldered the Sega's shoulder button microswitches onto the knock-off's PCB, and now the buttons are much lighter.