Set up your searches on ebay etc, check them daily, hope to get lucky.

What's your laptop, and what other ports are available (serial/parallel/USB)? You may find another option that works for you, eg:

GamepadLPT
Does anyone use SNESKey? Mine doesn't seem to work.
Are there any 9-pin serial gamepads (not joysticks) compatible with PCs (DOS)
Necroware's GamePort to USB adapter for analogue and digital joysticks
Volo's Gamepad to PS/2 Adapter. Device discussion (official thread) SOLD OUT (06.02.2023)