If you are specifically looking for the Mk4 rather than the newer model, you have a few specialized options:
: The ONE features a brighter, white backlight compared to the Mk4. Tips for Buyers thermapen mk4 where to buy
: Platforms like Ubuy or Desertcart sometimes list regional stock, but shipping costs and delivery times will be higher. Why the Thermapen Mk4 is Hard to Find If you are specifically looking for the Mk4