Nylon belts are the way to go, they can be super cheap too it's just nylon, and easy to replace and repurpose in general with removable buckles.

Even cheap generic, plastic buckles are extremely durable, have been using a couple for 4 years now. Amazon and ebay have resellers that sell them for $5-10, they likely come from China, could probably find them even cheaper on aliexpress if a person doesn't mind slow shipping.