If you're looking for Green Lantern merchandise, like replicas or costumes, you can try:
* Online retailers: Amazon, eBay, and other online stores often have Green Lantern merchandise for sale.
* Comic book stores: Many comic book stores carry a variety of Green Lantern merchandise, including action figures, collectibles, and clothing.
* Costume shops: If you're looking for a Green Lantern costume, costume shops are a good place to start.
Remember, these are fictional items, so you won't find a real ring with the power to control willpower!