Where can you find a refill for a pen that has a Mini Star refill in?

You can find a refill for a pen with a Mini Star refill at office supply stores, specialty stationery shops, or online retailers such as Amazon or the manufacturer's website. If you know the specific brand of the pen, checking the brand's official site may also provide options for purchasing replacements directly. Additionally, some larger bookstores might carry a selection of pen refills.